Features: brand new and high quality For radios:(For 2-pin plug.)CLS series: CLS1110, CLS1410, CLS1413, CLS1450, CLS1450C, CLS1450CB, VL50CP series: CP88, CP040. CP100, CP110, CP125, CP150, CP200, CP250, CP300CT series: CT150, CT250, CT450, CT450LSFDC: FD-150A, FD-450A, FD-160A, FD-460AGP series: GP2000, GP2100, GP300, GP308, GP68, GP88, GP88S, GP3188 Note: Not all radios have VOX capability. If the walkie-talkie does not have the VOX function, you need to turn the switch to the PTT function to return to the PTT call mode. P series: P040, P080, P1225, P1225LSPRO series: PRO1150, PRO2150, PRO3150RDX series: RDV-5100, RDV2020, RDU2020, RDU2080DD, RDU4100, RDU4160D, RDV2080D, RDV5100Spirit Series: SV10, SV11, SV11D, SV21, SV12, SV22, SV22C, SU210, SU22, SU22C, SU220 VHF/UHF Spirit, Lo Spirito Pro, Spirit Pro+, Spirit for HP 10SP series: SP10, SP21, SP50+, SP50 Spirit MU series: MU11, MU11C, MU11CV, MU12, MU12C, MU12CV, MU21C, MU21CV, MU22CVS, MU24CV, MU24CVS, MU24CVSTXTN series: XTN446, XTN500, XTN600Other series: LTS2000, VL130, PMR446, ECP100, PR400, mag One BPR400, EP450, AU1200, AV1200 VOX is an automatic voice transmission feature that eliminates the need to hold down a button during a call.PTT refers to the function of holding down the PTT for key to make a call. Specifications: Material: plastic + metal Size: Approx.150cm/47.24inch Package Includes: 1xMicrophones Headset note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.