Abstract: A helmet removal system includes a detachable helmet liner configured to be positioned in a helmet. The helmet liner includes a central portion configured to receive a user's head therein, a frontal portion integrally formed with the central portion and configured to engage a user's frontal head portion. The helmet liner further includes dual side tab portions integrally formed with the central portion. The dual tab portions are configured to be moved between a folded position, inside of the helmet, to an unfolded position. The helmet liner further includes a top portion extending between opposing edges of the central portion. The helmet liner also includes a rear portion integrally connected to the central portion to provide balanced engagement with the back of a user's head. Helmet removal is achieved by applying lateral pulling forces to the dual tab portions.

Abstract: A two way radio includes a first push to talk button and a second push to talk button. The first push to talk button is configured to cause transmission of a first signal on a first channel. The second push to talk button is configured to cause transmission of a second signal on a second channel. The first and second channels are in a single radio network. A radio peripheral device for operation with a two-way radio includes a connector configured to be connected to the two-way radio; a speaker configured to output audio based on a received audio signal that is received from the two-way radio via the connector; a microphone; a first push-to-talk button configured to provide a first indication to the two-way radio; and a second push-to-talk button configured to provide a second indication to the two-way radio.

Abstract: A two way radio includes a first push to talk button and a second push to talk button. The first push to talk button is configured to cause transmission of a first signal on a first channel. The second push to talk button is configured to cause transmission of a second signal on a second channel. The first and second channels are in a single radio network. A radio peripheral device for operation with a two-way radio includes a connector configured to be connected to the two-way radio; a speaker configured to output audio based on a received audio signal that is received from the two-way radio via the connector; a microphone; a first push-to-talk button configured to provide a first indication to the two-way radio; and a second push-to-talk button configured to provide a second indication to the two-way radio.

Abstract: A two way radio includes a first push to talk button and a second push to talk button. The first push to talk button is configured to cause transmission of a first signal on a first channel. The second push to talk button is configured to cause transmission of a second signal on a second channel. The first and second channels are in a single radio network.

Abstract: Various exemplary embodiments are a noise-cancelling microphone housing including a body and a round wind shield member having a round depression in the end facing away from the body. The body is sized such that at least one microphone element will fit inside. The wind shield member is positioned such that in the course of normal use, wind directed toward the microphone will be intercepted and deflected by the wind-shield element. Deflecting wind away from the noise-cancelling microphone allows the microphone to produce a high-quality signal in spite of heavy winds. Various embodiments may also include a cover made of noise-damping material and/or holes through at least one face of the housing such that sound may pass through and reach the interior where the microphones are located.

Abstract: Various exemplary embodiments are a noise-cancelling microphone housing including a body and a round wind shield member having a round depression in the end facing away from the body. The body is sized such that at least one microphone element will fit inside. The wind shield member is positioned such that in the course of normal use, wind directed toward the microphone will be intercepted and deflected by the wind-shield element. Deflecting wind away from the noise-cancelling microphone allows the microphone to produce a high-quality signal in spite of heavy winds. Various embodiments may also include a cover made of noise-damping material and/or holes through at least one face of the housing such that sound may pass through and reach the interior where the microphones are located.

Abstract: A two way radio includes a first push to talk button and a second push to talk button. The first push to talk button is configured to cause transmission of a first signal on a first channel. The second push to talk button is configured to cause transmission of a second signal on a second channel. The first and second channels are in a single radio network.