CP0257L Features Supports telling numbers via voice and Bluetooth calling Supports an external TF card High quality sound effect Comes with LED indicators Easy to operate Compact size for ease of carrying General Specs Brand & Model My vision Output Power 3W Charging Voltage 5V Battery Built-in rechargeable lithium battery Charging Time 2 hours Playing Time 3 hours Ports 1 x TF card slot， 1 x 5-pin USB， 1 x 3.5 mm port Compatibility Bluetooth Smartphone and tablet PCs