CP0275Y Features Supports Bluetooth V2.1 Operating distance is up to 10 m Allows you to enjoy your favorite music at anytime Compact size for ease of carrying General Specs Brand & Model 901 Bluetooth Version V2.1 Operating Range Up to 10 m Working Time Up to 5 hours Battery Capacity 520mAh Input Voltage 5V Charging Time 2 hours Frequency Range 280Hz-16KHz Speaker 52 mm S/N Ratio ≥95dB Compatibility Bluetooth cell phones， tablet PCs， etc.