Product information:Transmission range: 5 metersFunction: Power display, call function, NFC function, voice control, music support, multi-point connectionBluetooth protocol: 2.0Channel: StereoHow to use: Earplug typeColor: black steel belt, green and black silicone, red and black silicone, silver steel belt, gold steel beltMold type: public moldChip type: Zhongke LanxunLife time: 6 (hours) Packing:Silicone Smart Watch X1