Product Information: Functions: 1.(power on)turn on the headset after the red and blue lights flashalternately for 5 seconds. When the blue light flashes, wait for 3 secondsto enter the pairing state and enter the standby mode 2. The red light of the(shutdown) indicator light turns off after 5 seconds 3. (low power) the red light flashes every three seconds 4.(charging) the red light of the indicator is always on 5.(charging completed) the blue light is on for a long time 6. Press and hold the power on button for 3 seconds to turn on and off thehone. The"power on"tone will automatically connect the phone afterpower on Single ear: 1. Press and hold for 3 seconds to turn on and off 2. Press Chinese and English to switch when it is not connected after power on 3. After connecting the mobile phone, press play / pause / answer 4. Press 3 times to the previous song/Press twice to reject the call 5. Press 2 times for the next song Distance: 10 meters Talk time: about 100 hours Listening time: about 88 hours Headphone battery: 350MAH Wireless frequency: 2.4GHZ Support agreement: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 Transmission distance: 10 meters Charging voltage/current: 5V/1A Charging time: about 2 hours Standby time: 2220 hours Speaker impedance: φ8MM 32&; Microphone sensitivity: -42Db Working temperature: -10-50℃ Headphone weight: 15.2G Headphone size:7.4x6x2.2CM Package Content: 1 x Bluetooth headset Note: Please allow a little error on the size due to manual measurement. The color might exist slightly difference due to different displays.