1. The product should be far away from high temperature and humidity environment. 2. It should be kept away from WiFi and routers and other high-frequency transmitters, which will affect the reception of the signal, resulting in sound jamming and forging. 3. Please use this product in a valid environment (15-20m) and there is no physical blocking between Bluetooth devices and headphones (such as walls, etc.). 4. If the headset is idle for a long time, please charge it before use. 5. Bluetooth:5.0,earphone power:50mAh,battery charger:400mAh. 6. Support agreement:HFP 1.7,HSP 1.2,A2DP 1.3, AVRCP 1.6.