time up to 300 hours. Powerful features: After pairing with your phone via bluetooth, this motorcycle bluetooth headset will automatically answer calls after 3 seconds, you can also listen to GPS navigation or listen to music while riding. 2 intercom modes: normal intercom mode and private intercom mode. ESP noise reduction: With improved noise cancellation technology, it supports A2DP premium quality stereo sound, which helps reduce annoying noise caused by wind, engine and surroundings. Support calls at a maximum speed of 120km/h Protects against fog, rain and sweat immersion,Wind-proof. For Motorcycle rider, skiing enthusiast, firefighter, traffic policeman,etc. Charging: 1)Before using the Bluetooth intercom, please charge it with the dedicated charging cable included. Small TYPE-C on the charging cable connect to the intercom USB, and the big USB on the cable connect to the followings: A.USB on the computer; B.the output of power bank is DC 5V; C.the output of power adapter USB is DC 5V. 2)the red LED turns on when charging, after fully charged, the LED gradually turns off. Charge time is about 2.5H. Specifications: Color: Gray Bluetooth Version: 5.1 Bluetooth Suported: a2dp, avrcp, hs/hf Intercom Wireless Transmission Range: 1200M Battery Capacity: 850mA Distance between Mobile Phone and Intercom: 10M Charge Voltage: 5V Working Time: 20H Standby Time #xff1a;300H Charging Time #xff1a;2.5H Speaker Diameter: 38MM Operating Temperature Range: -40-60 Charging Method: TYPE-C USB Power Adapter: DC 5V 1A(optional) Package Size:22.2 * 9.8 * 5.7cm Package Weight:374g Package List: 1 * Host 2 * Earphone 2 * Fastener Tape 1 * Clip 2 * Screws 1 * Screwdriver 2 * Charging Cable 1 * Instruction Manual