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NOTE: 1.Adapter cable ONLY suitable for Retevis: RT21, RT22, RT24, RT7, RT27, H-777 six models. If your walkie talkies is NOT in the list, please do not buy. 2.Avoid to use larger power(better under 2w) and strong signal walkie-talkie, so as not to affect the normal use of the product. Applicable to VOX launch, but depends on the sensitivity of the headset microphone. Compatible Two Way Radio: ONLY for Retevis:H777/RT21/RT22/RT24/RT7/RT27 How to Use 1. Connect the 2 pin to 3.5mm Retevis Adapter to radios and cellphone headset 2. Turn on the radios with same channel frequency, and make sue the volume on your preferred level 3. Short press the Headset Mic to active the PTT function to transmit. (Note:If your headset without mic, you need use the radios body PTT button.) 4. Longer press the headset mic(about 2 -5S) to over transmitting. Package Includes: 5 x Retevis 2 Pin to 3.5mm Adapter 1 x User Manual