Standard headphone jack: The PTT adapter fits civilian headphones with a 7mm or 7.1mm headphone jack, including the Nexus TP-120 U-174 U-in headphone jack. Please note that the adapter is compatible with commercial wired headsets in a civilian version, including the TAC Z Z-TAC headset in a civilian version. Not compatible with Definition headphones. Back clip and coiled cable: The PTT adapter features a sturdy metal clip with a sawtooth design on the back of the adapter that provides a strong grip on your clothing or strap, preventing it from easily falling off while traveling. The coiled cable is made of ABS, offering high flexibility and toughness, anti-stretch and anti-bend resistance, and is not easy to break. It is waterproof and has a length of 50cm to 200cm, providing ample length for easy use. Widely compatible: This PTT adapter is compatible with radios including CP88, CP100, CP150, CP200, CT150, CT250, CT450, CT450LS, ECP100, GP68, GP88S, GP308, GP350, GP2000, GP3688, GP3188, GTI, GTX, LTS2000, P040, P080, P110, P200, P1225, P1225LS, PR400, PRO1150, PRO2150, PRO3150, PMR446, SP10, SP21, VL50, and VL130. Please refer to the specifications for more detailed models. Anti-slip switch: The PTT adapter has a large and sensitive push-to-talk switch design, easy to use even with thick gloves, allowing you to easily turn on the microphone and make quick calls. Plug and play, easy to install. Application: The PTT adapter is ideal for connecting 7mm and 7.1mm civilian-style headsets to radios, such as noise-canceling headphones, mid-sized throat microphones, full-face headsets, and vibrating microphones with professional earphones. The sound is clear and suitable for noisy environments and outdoor activities.