Description: Bluetooth 5.0 chip: Adopt BT5.0 technology ,wide coverage, fast speed and more stable connection, low power consumption. 2 Phones Connected Simultaneously: Connect 2 mobile devices at the same time, support navigate, listen to music , intelligent voice assistant and automatically answer calls, no need to reach for the phone, easy to use and safer to ride. Large Capacity Battery: Built in 450mAh battery, support long term work. 3 hours charging time, 16 hours playback time, 720 hours long standby time. Smart Noise Cancellation: Identify and reduce ambient noise, clear sound quality. Wide range of applications: Riding a motorcycle, skiing, climbing, cycling, etc. Specification: Type: Motorcycle Helmet Bluetooth Headset Bluetooth version: V5.0 Frequency range: 2.402GHz-2.480GHz Charging time: ≤3 hours Standby time: ≤720 hours Continuous working time: ≤16 hours Range: ≤10 meters (depending on the device and environmental factors, such as obstacles) Transmission distance of microphone: ≤1m Unilateral headset power: 0.5W Li-ion battery: 3.7V/450mA Charging voltage: 5V Function: support music, call back, call function, switch between Chinese and English, can answer automatically Net weight: 68g Diameter 48.8mm, thickness 15mm Size Chart: Package size: 180x100.8x25.7mm/7.09x3.97x1.01inch Package Includes: 1 Piece Wireless Headset 1 Piece Charging Cable Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!