Specification: Material: plastic Color: black Power supply voltage: DC9-100V Peak power: 18W Frequency response: 80Hz-20KHz Charging voltage: DC5V Maximum charging current: 2500HA Horn impedance: 4 Peak power of horn: 18W Distance of Bluetooth-compatible in open ground: 20M Bluetooth-compatible name: HY1688 Size: about 65 * 58mm/2.56 * 2.28inch Wiring: 1. Small charging socket, connected with USB; 2. Large power supply plug, linked with locking control. Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Stereo