Model Number: Ultra K3-A Bluetooth Version: Bluetooth 4.1, Class 2. Frequency Range: 2.402 ~ 2.480GHz Bluetooth Profiles: A2DP, AVRCP, Headset. Operating Distance: 10m (33ft) Battery: Built-in 3.7V / 70mAh Li-ion polymer rechargeable battery Music Playing Time: 4 ~ 5 hours
