Bluetooth chip: RELTEK BTL8763B V5.0Working frequency: 2.402-2.480GHz Support agreement: HSP/HFP/A2DP/AVRCP Transmission distance: 10 meters Speaker diameter 6mm graphene Listening to music for 5.5-6.5 hours Talk time: 8 hours. Standby time: about 100 hours. Headset: 3.7V lithium battery 60mAh Charging bin: 1200mAh The color is red, blue, yellow, and all black. Function: waterproof, touch control, double earplug, stereo, long working life.