Description: Features: 100% brand new and high quality 1. All-metal housings, smart small size, suitable for all kinds of occasions 2. Removable back clamp design, available to use in-car or take along 3. Built-in DSP independent amplifier, HIFI sound quality, super anti-interference 4. Voice prompt, coming call in Chinese and English 5. Support Bluetooth hands-free call function 6. Support Bluetooth A2DP stereo 7. Support Chinese and English models 8. Support to connect two phones simultaneously. 9. Support Bluetooth handsfree/answer/ hang up/ reject/ redial call and other telephone functions 10. Echo cancellation and noise suppression (CVC) function 11. The product automatically power off after 10 minutes without a Bluetooth connection Usage: 1. Power on: long press the button o on the Bluetooth music receiver for 3s until the red and blue LED light flash alternately. 2. Power off: long press the button o for 5s, then the red LED light will be bright and then close 3. o : button "o" for multi-function button, short press for play/pause/answer/hang up; Long press for power on/off; Long press also for reject the incoming call; Double-click for the redial 4. + : long press button + for next song, short press for the volume + 5. - : long press button - for prev. song, short press for volume 6. Switch English and Chinese: when power on without Bluetooth connection, press "+" and "-" for 3s, Chinese and English will switch This product can connect two phones simultaneously, manually operate the first mobile phone, and disconnect the Bluetooth on the phone, then the product re-enters the pairing mode. Open the Bluetooth on the second phone and search, find the product pairing name, connected, and the blue light flash slowly after connection Specifications: Material: Metal Color: Gold Size: 50×15mm/1.97×0.59in Bluetooth V4.2+EDR Transmission distance: 10m Frequency: 2.4GHz Limit working voltage: 2.80V-4.20V Working temperature: -20°-50° Effective distance of Mic.: 0-1m 3.5mm stereo audio input Micro USB charging port Bluetooth Pairing Name: BT810REV Working time up to 8 hours Charging time: 2 hours Quantity: 1 Set (other accessories demo in the picture is not included) Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 X Bluetooth Music Receiver 1 X Micro USB Charging Cable 1 X 3.5mm Male To Male Adapter 1 X User Manual(English & Chinese)