8D surround sound, 5.0 dual-ear chip, large capacity, true wireless Bluetooth headset. 2, Graphene bass diaphragm, HIFI high-frequency technology, 10MM dynamic speaker, Two connection methods: single / double free to use, single ear listening to enjoy alone, listening to HiFi stereo in both ears. 4, 5.0 automatic boot pairing, built-in active noise reduction IC, HD call. 5, 5.0 Bluetooth game without delay, the electric cabin can be used as a mobile phone bracket mobile phone emergency power supply, multi-function use. Specifications:.Model: F9. Type: Headphone. Headphone type: in-ear headphones. Bluetooth protocol: HFP/HSP/A2DP/AVRCP. Music time: about 150 hours. Call time: about 150 hours. Battery capacity: 2000mAh. Bluetooth distance: about 10 meters. Waterproof: life-grade waterproof. Connection method: single/double free to use. Color: black. Function: music play / pause, call answering noise reduction, IOS power display, voice prompt Bluetooth version: V5.0. Compatible devices: Bluetooth devices such as for Xiaomi, Samsung, Apple, Huawei, oppo, vivo, Lenovo, tablet, etc. (With Bluetooth, you need to use a Bluetooth adapter