about this project 1. Bluetooth V5.0: Provide purer wireless audio through Bluetooth V5.0, intelligent control makes technology a necessity for your modern life. 2. Battery life and fast charging: H7 bluetooth earphones can provide 6-8 hours of excellent sound quality on a single charge. Up to hours of continuous talk time and up to 300 hours of standby time. (depending on usage) 3. Advanced Compatibility: Can be compatible with most bluetooth devices, such as mobile phone/PC/laptop/tablet/MP3/TV. 4. Always comfortable: The roomy and soft earcups fit perfectly, ensuring a high level of wearing comfort, even during long sessions. 5. Three-in-one multi-function: buy one headset, you can experience three different playback modes (wireless/wired/TF card mode), to meet your daily diverse needs, it is worth a try. 6. HD Microphone: The built-in microphone and the buttons on the ear cups can conveniently control your music and calls. - Basic parameters Model: H7 Battery capacity: .400m - Ah with protection board Bluetooth version: V5.0+EDR Charging time: 1-2 hours (5V/1A) Color: elegant black Playing time: 16 hours at medium volume Frequency response: 20Hz- -20KHz Weight: bare metal 230G, gross weight 345G Output power: 40m - W Function: wireless bluetooth/with FM/card/computer headset Transmission distance: barrier-free 10-15 meters Interface: 3.5mm audio jack, TF bayonet, Type-C charging port SNR: 85d - BPackage Included 1 * bluetooth headset 1 * USB charging cable 1 * User Manual