... -in lithium battery.4. Support TF card(Mini micro card)5. Support A2DP,AVRCP,headset,handfree profileSpecifications:1. Bluetooth protocol: version ... ~20KHz5. Signal-to-noise ratio:>76dB6. Talking time:up to 5 hours7. Charging time: about 2 hours.8. Power supply: USB ... . Color: Black,Red,Blue,SilverAccessory:1. USB Charging line.2. User guide.