RETEVIS TCK01 Kenwood 2 Pin to 3.5mm Female Mobile Phone o Earphone Transfer Cable for RT21, RT22, RT24, RT7, RT27, H777 1. If the transmission power of a walkie-talkie exceeds 2W, the signal may be too strong and could interfere with the patch cord's PCB board, potentially preventing the transmission signal from turning off. 2. The patch cord stability test is only applicable to Retevis models: RT21, RT22, RT24, RT7, RT27, H777 3. High quality with long service life 4. Cable length: 145mm 5. Weight: 10 grams Usage and precautions: 1. Insert the plug of the adapter cable into the earphone jack of the walkie-talkie 2. Insert the earphone into the earphone jack of the adapter cable to activate the intercom function 3. Press the call button on the headset; the PTT light on the walkie-talkie will illuminate, allowing you to speak using the headset microphone 4. Long press the button on the headset for more than 0.5 seconds to turn off the PTT light and return the walkie-talkie to standby mode 5. When using the headset for communication, ensure the transmitter is turned off promptly after completing the call 6. Avoid using with high-power walkie-talkies that emit overly strong signals to prevent interference with normal product operation 7. When voice activation is enabled on the walkie-talkie, the voice sensitivity of the mobile phone headset may be very low, resulting in limited or non-functional voice control performance