The Sheepdog SD-AT-3.5TC Police Listen / Receive Only 3.5mm Threaded Earpiece is compatible with audio adapters and shoulder speaker microphones that accept a 3.5mm threaded plug. Designed with Public Safety in mind, the SD-AT-3.5TC headset has Kevlar cabling and durable strain reliefs. Connects directly to audio adapters or speaker microphones. Equipped with metal clothing clip to secure earpiece to collar. Once connected, radio traffic becomes private as it is redirected from speaker microphone to the user’s ear. Be ready for any audio environment and all day comfort with the SD-AT-3.5TC Listen Only Kit. The acoustic tube can be cut to desired length. Release the acoustic tube by turning quick-twist connector counterclockwise and pulling away from transducer. The tube can be cut above or below coil. Simply reattach elbow or quick-twist connector, push back into transducer, and turn clockwise to lock into place. The Sheepdog SD-AT-3.5TC Law Enforcement Earphone Kit includes Sheepdog Listen Only Wire with 3.5mm plug, Left and Right Medium Semi-Custom Open Ear Insert Earmolds, Clear and Black Coiled Acoustic Audio Tubes, Standard Clear and Flesh Mushroom Ear tips as well as a Noise Reducing Dual-Layer Earbud. Compatible with Motorola BDN6676 audio adapter, BDN6783 audio adapter, speaker microphones NMN6247, NMN6250, NMN6251, NMN6272, NMN6274, NNTN8383, PMMN4084 and other remote speaker mics (RSM) that accept a 3.5mm threaded listen only earpiece/headset.