CP0371Y Features Built-in Microphone， supports hands-free calls Supports TF card reader and external audio signal input Built-in high capacity rechargeable lithium battery Conveniently charged via USB cable Supports an external TF card Compatible with Bluetooth v3.0 enabled digital devices Compact size for ease of carrying General Specs Brand & Model S06B Bluetooth Version V3.0+EDR Remote Range Up to 10 m Dimensions 60 x 60 x 50 mm Net Weight 230 g Working Time 5 h Loudspeaker Output 3 w Frequency Response 280Hz-16KHz Signal-to-Noise ≥95dB Distortion ≤0.5% Battery Capacity 520mAh Battery Charging Voltage 5V±0.5V Battery Charge Time 2 h