Features:1, 8D surround sound, dual-ear chip, large capacity, true wireless Bluetooth headset2, Graphene bass diaphragm, HIFI high-frequency technology, 10MM dynamic speaker unit3, Two connection methods: single / double free to use, single ear listening to enjoy alone, listening to HiFi stereo in both ears.4) automatic boot pairing, built-in active noise reduction IC, HD call.5)Bluetooth game without delay, the electric cabin can be used as a mobile phone bracket mobile phone emergency power supply, multi-function use.Model: F9Headphone type: in-ear headphonesBluetooth protocol: HFP/HSP/A2DP/AVRCPBattery capacity: 2000mAhBluetooth distance: about 10 metersWaterproof: life-grade waterproofConnection method: single/double free to useColor: blackFunction: music play / pause, call answering noise reduction, IOS power display, voice promptBluetooth version: V5.1Compatible devices: Bluetooth devices such as for Xiaomi, Samsung, Apple, Huawei, oppo, vivo, Lenovo, tablet, etc. (With Bluetooth, you need to use a Bluetooth adapter)Tip: Do not touch hot water