Specifications 1. Compatible with Bluetooth phones, MP3/MP4/CD/PC/MAC/PSP, etc. 2. Built-in lithium battery:3.7V/700MA,it can used for NOKIA Mobile 3. Bluetooth protocol: version 2.1+EDR4. Support A2DP,AVRCP,headset,handfree profile5. Input sensitivity: 300MV6. Color : Black7. requency range:80Hz~20KHzv8. Signal-to-noise ratio:>76dB9. Power supply: USB Power10. Rated power:3w*211. Standby time:80-100hours12. working time:3hoursPackaging include:Bluetooth Speaker x 1USB Charging line x 1Audio cable x 1LI-battery x 1