Bluetooth Wireless Connection Retro Microphone External Mobile Phone Handset 1. Function: support Bluetooth 5.0, support listening, support HFPV1.5HSPV1.1 2. Working voltage: DC 4V 3. Battery capacity: 200mAh 4. Charging time: about 4h 5. Use time: about 12h 6. Charger input: DC 5V, 300mA 7. Frequency: 2404-2479MHZ 8. Communication distance: about 10M without obstacles Steps to use: 1. Start power: when using Bluetooth, long press the function key blue light red light at the same time, and flashing 2. Bluetooth pairing: start the Bluetooth function of the cell phone, open the Bluetooth search function, search for the NFXSL model, select the model, and then the blue light flashes that the pairing is successful 3. Answer the call: when the phone calls, the phone will still ring the incoming call, press the Bluetooth handset function key to answer the call. 4. End the call: after the call, press the Bluetooth handset function key, that can end the call 5. Reject the call: when the phone calls, press and hold the function key for two seconds, then release it to reject the call 6. Redial: redial the last call, double-click the function key or long press the function key for two seconds to achieve redial function 7. Shutdown: long press the function key, the red light is on, that is, shutdown 8. Charging headset indicator shows red light, when the headset is charged, the red light will go out blue light long light