Bluetooth Earbuds Wireless Earphones Noise Canceling Stereo Headset Headphone : Low power consumption, long battery life and long standby time are available after fully charged. Two connection methods: single / double use, listen to one ear to enjoy alone, listen to HiFi stereo in both ears. The headphones can be charged several times from the charging case. Automatic boot pairing, built-in active noise reduction IC, HD call. 8D surround sound, 5.0 dual-ear chip, large capacity, real wireless Bluetooth headset Specification: Model: F9 Bluetooth version: 5.0 Noise reduction version: CVC8.0 Battery capacity of the earphones: 50mAh Charging box battery capacity: 3500mAh Working distance: 10 meters Auto On: support Automatic pairing: support Function: Play / pause (single click), answer / hang up (single click), wake Siri (short press), volume control (press three times), switch songs (double click), on / off (long press for 5S) Delivery content: 2 x earphones 1 x charging box 1 x charging cable 1 x user manual