Features: Full-duplex bluetooth-compatible real-time intercom: ultra-high and excellent sound quality, effectively noise reduction, even when driving at high speed up to 150km/h, you can clearly answer calls and intercoms. Remote Intercom: support multi-person intercom, the longest distance is at a remarkable range of up to 1.5km, just enjoy the pleasant talking with your friends or travel companions,s ay good bye to boring journey. Long Battery Life: built-in 850mAh large capacity battery, it takes about 2.5 hours to be fully charged, lasts about 30 hours talking, 500 hours standby. IP65 Waterproof: double for protection for internal parts, allows you to answer calls while riding your motorcycle in bad weather such as rainy, snowy day. Stylish Appearance: brand new exterior design, blends naturally with your helmet, ultra-slim and lightweight making your riding trip more enjoyable, comfortable and exciting. Specifications: BT Version: BT5.1 Intercom Distance: 900M ,1500M The Longest Distance of Bluetooth-compatible Link: 50 meters Support Bluetooth-compatible Protocol: A2DP,AVRCP,HS\HF Interface: Type-C Battery Capacity: 850mAh Talk Time: 30Hrs Standby Time: 500H Charging Time: 2.5H Charging Voltage: 5V Horn Diameter: 40mm Signal Frequency Range: 2.402GHZ-2.480GHZ Waterproof Level: IP65 Operating Temperature Range: -40-60 Material: ABS Size: Approx. 10.1x5.4x2 for cm/3.97x2.12x0.78 inch Quantity: 1 Piece/1 Pair(optional) Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Headset 1x Clip 1x Screw Bag 1x Screwdriver 2x Fastener Tape 1x Charging Cable 1x User Manual