CP0379Y Features Wireless Bluetooth speaker for cell phones Designed with a Micro TF card slot Supports Bluetooth 3.0 version Wireless effective range is up to 10 meters Lightweight for ease of carrying General Specs Brand & Model S-03   Bluetooth Version V3.0 Operating Range Up to 10 m Working Time 5 hours Speaker Φ45mm Loudspeaker Output 3W Frequency Response 280HZ-16KHz Signal-to-Noise ≥95dB Distortion ≤0.5% Battery Capacity 520mAh Battery Charging Voltage 5V±0.5V Battery Charge Time 2 hours