CP0258S Features Built-in rechargeable lithium battery Standard USB/DC charging port Features LED indicator Digital power amplifier Easy to operate Compact size for ease of carrying General Specs Brand & Model My vision KB-10 Output Power 3W Charging Voltage 5V Battery Built-in rechargeable lithium battery Charging Time 2 hours Playing Time 3 hours Ports 1 x Micro USB， 1 x 3.5 mm port Compatibility Bluetooth Smartphone and tablet PCs