Working frequency: 2.4GHzBluetooth version: 5.1Supported BT protocol: A2DP and AVRCPOperating range: up to 10-20 meters for cell phonesBattery type: 1000mAh rechargeable lithium polymerStandby time: up to 500 hoursTalk time:up to 28 hours in phone call intercom mode;up to 33 hours in music modeCharging time: about 2 hoursPower adapter requirement: 5V/1ACharging port: Type-COperating temperature: 41°F-104°F(5°C-40°C)Storage temperature: -4°F-+122°F (-20°C-+50°C)Color: As shownMaterial: ABSPackage Contents:2 x for Host2 x USB Cable2 x Headphone Cable2 x Hard Mic & Soft Mic2 x Flat Mount2 x Clip Mount2 x Buckle Package2 x Screwdriver2 x Fastener TapeOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.