Working distance: 1000m for two people,2000m for group intercom (under ideal environment) Working frequency: 2.4GHz Bluetooth version: Bluetooth 5.1 Supports Bluetooth protocols: A2DP and AVRCP Operating range: up to 10 meters for cell phones Battery type: 1000mAh rechargeable lithium polymer Standby time: up to 500 hours Talk time: up to 28 hours in phone call/intercom mode, up to 33 hours in music mode Charging time: about 2 hours Power adapter requirement: DC 5V 1A USB A Charging port: TYPE-C Operating temperature: 41°F-104°F (5°C-40°C) Storage temperature: -4°F-+122°F (-20°C-+50°C) Color: As shown Material: ABS Package Contents: 2 x X6 Pro Host 2 x USB Cable 2 x Headphone Cable 2 x Hard Mic & Soft Mic 2 x Flat Mount 2 x Clip Mount 2 x Buckle Package 2 x Screwdriver 2 x Fastener Tape 1 x English instruction manual Only 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.