CP0255B Features Mini Bluetooth speaker with stereo sound effect Built-in lithium battery Charged via a Micro USB cable 3.5 mm audio port Low power consumption Allows you to enjoy high quality music at anytime and anywhere Compact size for ease of carrying General Specs Brand & Model KTS-07   Bluetooth Version V2.0+EDR Output 3W Speaker Diameter 45 mm Frequency Response 80Hz-20KHz S/N ≥85dB Impedance 4ohms Transmission Range 8-10 meters Battery Built-in lithium battery Power Supply Charged via a Micro USB Compatibility iPhone， iPad， Bluetooth stereo cell phones