Abstract: A sound providing method using an earphone set and an earphone set are provided. The sound providing method using the earphone set includes simultaneously providing a first sound wave to a left ear of a user by using a left ear earphone of an earphone set and a second sound wave to a right ear of the user by using a right ear earphone of the earphone set. There is a frequency difference between a first frequency of the first sound wave and a second frequency of the second sound wave. The frequency difference automatically and cyclically changes along with time.

Abstract: A sound adjustment device including a background sound source, an external sound source receiver, a frequency adjuster, a mixer, and an output port. A background audio signal provided by the background sound source is a mono audio signal. The external sound source receiver is used to receive an external audio signal. The frequency adjuster is used to receive and adjust the background audio signal into a left ear background audio signal and a right ear background audio signal. A first frequency of the left ear background audio signal and a second frequency of the right ear background audio signal have a frequency difference. The mixer is used to mix the external audio signal and the left ear background audio signal into a left ear audio signal, and to mix the external audio signal and the right ear background audio signal into a right ear audio signal.

Abstract: An earphone with binaural beats function includes a left ear speaker configured to provide a first sound wave to a left ear of a user, a right ear speaker configured to provide a second sound wave to a right ear of the user, a wireless communicator, and a frequency adjuster signally connected to the left and right ear speakers via a wire, and signally connected to the wireless communicator. The frequency adjuster receives an external audio signal from the wireless communicator, and adjusts the external audio signal to a first audio signal and a second audio signal to then transmit to the left and right ear speakers respectively, so that the left and right ear speakers emit the first sound wave and the second sound wave respectively. A first frequency of the first sound wave and a second frequency of the second sound wave have a frequency difference.

Abstract: A collapsible stroller comprising a handle assembly, a front leg assembly and a rear leg assembly pivotably connected to one another such that the stroller is able to be moved between a folded configuration, where the front leg and handle assemblies are folded to positions substantially adjacent to the rear leg assembly, and an unfolded configuration, where the front leg and handle assemblies are unfolded to positions away from the rear leg assembly, and a link assembly comprising a front member and a rear member pivotally connected to one another, wherein the front member is pivotally connected to an intermediate portion of the front leg assembly and the rear member is pivotally connected to an intermediate portion of the rear leg assembly, such that when the stroller is moved to its folded configuration the front and rear members are folded toward each other to lie substantially adjacent to one another and the front and rear leg assemblies, and when the stroller is moved to its unfolded configuration the fr

Abstract: A sound providing method using an earphone set and an earphone set are provided. The sound providing method using the earphone set includes simultaneously providing a first sound wave to a left ear of a user by using a left ear earphone of an earphone set and a second sound wave to a right ear of the user by using a right ear earphone of the earphone set. There is a frequency difference between a first frequency of the first sound wave and a second frequency of the second sound wave. The frequency difference automatically and cyclically changes along with time.

Abstract: A brain wave induction method is provided. In the method, a first sound wave to a left ear of a user and a second sound wave to a right ear of the user are simultaneously provided. There is a frequency difference between a first frequency of the first sound wave and a second frequency of the second sound wave. The frequency difference is automatically changed along with time.

Abstract: A pair of audio glasses and an audio device are provided. The pair of audio glasses includes a glasses body. The glasses body has a wireless transmission device, a first connector and an audio processor. The audio processor is electrically connected to the wireless transmission device and the first connector. The audio device includes a main body. The main body is configured to be assembled to a glasses and has a wireless transmission device, a first connector and an audio processor. The audio processor is electrically connected to the wireless transmission device and the first connector.

Abstract: A collapsible stroller comprising a handle assembly, a front leg assembly and a rear leg assembly pivotably connected to one another such that the stroller is able to be moved between a folded configuration, where the front leg and handle assemblies are folded to positions substantially adjacent to the rear leg assembly, and an unfolded configuration, where the front leg and handle assemblies are unfolded to positions away from the rear leg assembly, and a link assembly comprising a front member and a rear member pivotally connected to one another, wherein the front member is pivotally connected to an intermediate portion of the front leg assembly and the rear member is pivotally connected to an intermediate portion of the rear leg assembly, such that when the stroller is moved to its folded configuration the front and rear members are folded toward each other to lie substantially adjacent to one another and the front and rear leg assemblies, and when the stroller is moved to its unfolded configuration the fr

Abstract: A surgical audio and video collection device includes a processor, a video camera and a skin-touch vibration pickup. The video camera electrically connected to the processor is used to be worn on the body of the surgical operator and record video. The skin-touch vibration pickup is used to be attached on the skin of the surgical operator and sense the vibration of the skin to pick up the sound. The skin-touch vibration pickup is signally connected to the processor to transmit voice message to the processor. The voice message includes at least one of voice commands for controlling the video camera and voice tags for being added to the video recorded by the video camera.

Abstract: A collapsible stroller comprising a handle assembly, a front leg assembly and a rear leg assembly pivotably connected to one another such that the stroller is able to be moved between a folded configuration, where the front leg and handle assemblies are folded to positions substantially adjacent to the rear leg assembly, and an unfolded configuration, where the front leg and handle assemblies are unfolded to positions away from the rear leg assembly, and a link assembly comprising a front member and a rear member pivotally connected to one another, wherein the front member is pivotally connected to an intermediate portion of the front leg assembly and the rear member is pivotally connected to an intermediate portion of the rear leg assembly, such that when the stroller is moved to its folded configuration the front and rear members are folded toward each other to lie substantially adjacent to one another and the front and rear leg assemblies, and when the stroller is moved to its unfolded configuration the fr

Abstract: A collapsible stroller comprising a handle assembly, a front leg assembly and a rear leg assembly pivotably connected to one another such that the stroller is able to be moved between a folded configuration, where the front leg and handle assemblies are folded to positions substantially adjacent to the rear leg assembly, and an unfolded configuration, where the front leg and handle assemblies are unfolded to positions away from the rear leg assembly, and a link assembly comprising a front member and a rear member pivotally connected to one another, wherein the front member is pivotally connected to an intermediate portion of the front leg assembly and the rear member is pivotally connected to an intermediate portion of the rear leg assembly, such that when the stroller is moved to its folded configuration the front and rear members are folded toward each other to lie substantially adjacent to one another and the front and rear leg assemblies, and when the stroller is moved to its unfolded configuration the fr

Abstract: A speaker unit with dual diaphragms and dual coils includes a casing, first and second magnetic members, and first and second vibration systems. The casing has a chamber. The first and second magnetic members are disposed in the chamber. The first vibration system includes a first diaphragm fixed on the casing and located in the chamber, and a first coil fixed on the first diaphragm and located beside the first magnetic member. The first diaphragm has a ring shape. An orthogonal projection of the second magnetic member on an inner bottom surface of the casing is completely located in an orthogonal projection of a central opening of the first diaphragm on the inner bottom surface. The second vibration system includes a second diaphragm fixed on the casing and located in the chamber, and a second coil fixed on the second diaphragm and located beside the second magnetic element.

Abstract: A speaker unit with dual diaphragms and dual coils includes a casing, first and second magnetic members, and first and second vibration systems. The casing has a chamber. The first and second magnetic members are disposed in the chamber. The first vibration system includes a first diaphragm fixed on the casing and located in the chamber, and a first coil fixed on the first diaphragm and located beside the first magnetic member. The first diaphragm has a ring shape. An orthogonal projection of the second magnetic member on an inner bottom surface of the casing is completely located in an orthogonal projection of a central opening of the first diaphragm on the inner bottom surface. The second vibration system includes a second diaphragm fixed on the casing and located in the chamber, and a second coil fixed on the second diaphragm and located beside the second magnetic element.

Abstract: A collapsible stroller comprising a handle assembly, a front leg assembly and a rear leg assembly pivotably connected to one another such that the stroller is able to be moved between a folded configuration, where the front leg and handle assemblies are folded to positions substantially adjacent to the rear leg assembly, and an unfolded configuration, where the front leg and handle assemblies are unfolded to positions away from the rear leg assembly, and a link assembly comprising a front member and a rear member pivotally connected to one another, wherein the front member is pivotally connected to an intermediate portion of the front leg assembly and the rear member is pivotally connected to an intermediate portion of the rear leg assembly, such that when the stroller is moved to its folded configuration the front and rear members are folded toward each other to lie substantially adjacent to one another and the front and rear leg assemblies, and when the stroller is moved to its unfolded configuration the fr

Abstract: A speaker unit with microphone is provided. The speaker unit includes a housing, a cover, a vibration element and a microphone. The cover is assembled to the housing and forms a chamber with the housing. The cover has at least one audio hole. The vibration element is disposed in the chamber for generating sound toward the cover. The microphone is fixed on the cover and outside the chamber.

Abstract: A collapsible stroller comprising a handle assembly, a front leg assembly and a rear leg assembly pivotably connected to one another such that the stroller is able to be moved between a folded configuration, where the front leg and handle assemblies are folded to positions substantially adjacent to the rear leg assembly, and an unfolded configuration, where the front leg and handle assemblies are unfolded to positions away from the rear leg assembly, and a link assembly comprising a front member and a rear member pivotally connected to one another, wherein the front member is pivotally connected to an intermediate portion of the front leg assembly and the rear member is pivotally connected to an intermediate portion of the rear leg assembly, such that when the stroller is moved to its folded configuration the front and rear members are folded toward each other to lie substantially adjacent to one another and the front and rear leg assemblies, and when the stroller is moved to its unfolded configuration the fr

Abstract: A speaker unit with microphone is provided. The speaker unit includes a housing, a cover, a vibration element and a microphone. The cover is assembled to the housing and forms a chamber with the housing. The cover has at least one audio hole. The vibration element is disposed in the chamber for generating sound toward the cover. The microphone is fixed on the cover and outside the chamber.

Abstract: An in-ear microphone with active noise control is provided, including a housing, a speaker unit and a microphone module. The housing includes an air hole and a sound outlet. The speaker unit is disposed in the housing, and separates a space in the housing into a front chamber and a rear chamber. The microphone module is at least partially located in the front chamber and between the sound outlet and the speaker unit. The air hole is in communication with the sound outlet through the front chamber. The microphone module is configured to receive sound of a user and ambient sound.

Abstract: An in-ear microphone with active noise control is provided, including a housing, a speaker unit and a microphone module. The housing includes an air hole and a sound outlet. The speaker unit is disposed in the housing, and separates a space in the housing into a front chamber and a rear chamber. The microphone module is at least partially located in the front chamber and between the sound outlet and the speaker unit. The air hole is in communication with the sound outlet through the front chamber. The microphone module is configured to receive sound of a user and ambient sound.