Surveillance walkie talkie headset Compatible with CXT390 CXT545 CXT531 CXT195 CXT135 CXT145 etc CXT145 earpiece,clip this hands free earpiece onto your shirt, free your hands,easy to talk Built-in microphone with an inline PTT(Push To Talk) button that clips on your shirt, so you can use your radio device to communicate discreetly and easily, whether you're in security, retail or hospitality Excellent for use in police, military, nightclubs, bars, paintball, security, restaurants, hotels, bouncer, warehouses, and noisy environments PX655 earpiece offers sound without interference from surrounding noise,more accuratly conveying the human voice NOT compatible with Cobra Marine HH350 FLT, HH350W FLT, HH450 DUAL, HH450 CAMO, HH550 FLT BT radios.ONLY Compatible with 1-Pin Walkie Talkie Two Way Radio Motorola COBRA Microtalk CXT390 CXT545 CXT531 CXT195 CXT135 CXT145 Compatible Models: MT series: MT200, MT525, MT550, MT600, MT650, MT750, MT800, MT900, MT975,MT100, MT115,, MT250, MT300, MT550, MT615, MT850, PR series: PR240, PR245, PR260, PR350, PR375, PR385, PR550, PR560, PR580, PR590, PR3000, PR3100, PR3175, PR3180, PR3500, PR3550, PR3575, PR4000, PR4200, PR4250, PR4300, PR4700, PR4750, PR5060,PR237,PR650, LI series: Li-3900, Li-4900, Li-5600, Li-6000, Li-6500, Li-6700, Li-7000, Li-7200, Li-7020, Li-7500 CX series: CX80, CX105, CX105C, CX107,CX110, CX112,CX312 CXT series: CXT85, CXT88, CXT90, CXT94, CXT95, CXT125, CXT135, CXT145, CXT175, CXT195, CXT225,CXT227,CXT235,CXT237, CXT275, CXT280, CXT345 CXT390, CXT395, CXT400, CXT420, CXT425, CXT450, CXT531, CXT545, CXT595 CXR series: CXR700, CXR725, CXR750, CXR800, CXR825, CXR850, CXR875, CXR900, CXR920, CXR925, CXR950 CTW Series: CTW135P, CTW285P DC FRS Series: FRS132, FRS237 MRHH Series: MRHH100, MRHH200, MRHH330