Features: brand new and high quality Bluetooth-compatible provides instant pairing and stable transmission without interruptions. 450mAh battery that can last about 15hours talking for time on a full charge. Water resistant allows for universal pairing. Suitable for most types of motorcycle helmet. Rider to rider intercom distance : 800-1000 meters. Specifications: Material:ABS Size:Approx.8.5x5.5x2cm/3.35x2.17x0.79in Bluetooth-compatible Version: CSR2.1+ Edr Support Protocol: A2dp and Avrcp Battery Capacity: 450mah Charging Voltage/current: for Dc 5v / 160mah Intercom Distance: 800~1000 Meters Frequency: 2.4ghz Amplifier: Max97220a Working Time: About 15 Hours Mobile Phone Distance: 50 Meters Note: Please allow 1-2cm errors due to manual measurement, make sure that 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 Headphone 1x Microphone and ear speaker 1x Headset Clip 1x Screw Driver 1x USB Cable 2x Fastening Screws