Product details of F9 MINI True Earbuds Wireless Tws Earphones Bluetooth Stereo in ear Headphones with Mic, F9 Buds IPX7 Waterproof Sport Headset, Noise Cancelling Handfree (Power Bank only for Buds) Stereo bass sound touch plus for IOS Android Phone – Black True wireless stereo, HIFI sound. Both the left and right ears have full Bluetooth headset functionality and can be used individually or in pairs. Dual mode Bluetooth 5.1, ultra low power consumption. Bluetooth transmission distance: 10 meters barrier-free. Listening to song time: about3-4 hours. Battery capacity (charge box): Built-in 500mAh large capacity battery. Can charge headphones 2-3 times LED Dots power display, to avoid the embarrassment of suddenly running out of charge Adopting CVC 8.0 & DSP dual noise reduction technology Auto start and auto-match, auto-connect back to mobile phone Both the left and right ears have full Bluetooth headset functionality and can be used individually or in pairs. Bluetooth transmission distance: 10 meters barrier-free. 8D surround sound, 5.0 dual-ear chip, large capacity, true wireless Bluetooth headset. Features: Automatic pairing: 1. Remove the left and right (LR) headphones from the charging case. The ear will automatically open and connect 2. Turn on the phone Bluetooth search and click on the main headset name to pair. 3. When used again, they will automatically connect to your Bluetooth device True wireless stereo, HIFI sound. Both the left and right ears have full Bluetooth headset functionality and can be used individually or in pairs. Dual mode Bluetooth 5.1, ultra low power consumption. Bluetooth transmission distance: 10 meters barrier-free. Listening to song time: about 3-4 hours Battery capacity (charge box):Built-in 500mAh large capacity battery. Can charge headphones 2-3 Times Noise reduction technology: CVC8.0.