Description:1. Smart small size, suitable for all kinds of occasions 2. Built-in DSP independent amplifier, HIFI sound quality, super anti-interference 3. Power failure memory function 4. Voice prompt, coming call in Chinese & English 5. Support bluetooth hands-free call function 6. Support bluetooth A2DP stereo 7. Support Chinese & English models 8. Support to connect two phones simultaneously.9. Support bluetooth handsfree/answer/ hang up/ reject/ redial call & other telephone functions 10. Echo cancellation & noise suppression (CVC) function 11. The product automatically power off after 10 minutes without a bluetooth connection Feature:1. bluetooth V4.1+EDR, Max. transmission distance: 15m 2. Frequency: 2.4 G Hz 3. Limit working voltage: 2.80V-4.20V4. Working temperature: -20-505. Effective distance of Mic: 0-1m 6. 3.5mm stereo audio input 7. Micro USB (Universal Serial Bus) charging port 8. bluetooth Pairing Name: BT109. Working time: Up to 10 hours 10. Standby time: 100days 11. Charging time: 2hours Pairing the Device:1. Push the side switch into the pairing mode, the red & blue LED lights flash during pairing 2. Find the pairing name BT10 on your phone or related sender 3. Then the devices starts to pairing, the LED lights will turn blue & flash slowly after pairing successfully 4. To complete pairing, some devices may need input password, please enter 00005. This product can connect with two phones simultaneously, manually operate the first mobile phone, & disconnect the bluetooth from the phone, then