... factory 4,High quality with competitive price 5,OEM Portable mp3 player wireless headset1) bluetooth stereo headset 2) wireless net ... Guide1. Turn on the devicePower on Bluetooth,press the "Hands-free" key for about 5 seconds till the blue indicator starts ... ,77G * Measurement,15X15X6.5mm * Effective range, 10m Specifications*Decoder supported,MP3*SNR,90dB *THD: <0.1%*Frequency response: 20-20,000Hz ...