Abstract: The anti-loss component of the present invention is used for fastening to a wireless earphone, and the wireless earphone includes a main body part, an earplug part and a clamped part connected to the main body part and the earplug part. The anti-loss component includes: a circlip made of bent metallic wire, wherein the circlip includes a first arm and a second arm; a fastening space located between the first arm and the second arm; a gap linked and located on one side of the fastening space; and a tether connection part located on other side of the fastening space; the gap is used for allowing the circlip to elastically deform when the circlip is fastened to the clamped part; the first arm and the second arm are respectively provided with a guiding structure on two sides of the gap; the fastening space is used for storing the clamped part.

Abstract: An electromagnetic actuator includes: a rotor assembly, including an inner pipe and at least one magnet accommodated in the inner pipe; a stator assembly, sleeved over the rotor assembly; and at least one elastic member, located at one end of the rotor assembly. The stator assembly includes an outer pipe made of metal and sleeved over the inner pipe and at least one coil fixed outside the outer pipe. The coil applies a driving force to the magnet, and the magnet drives the entire rotor assembly to move along an extending direction of the outer pipe. An outer diameter of the inner pipe is less than an inner diameter of the outer pipe, and a shape of the outer pipe is identical to a shape of the inner pipe.