model:AV-555BT Output impedance:4-16 Ω USB:support microphone:support FM radio:support Treble adjustment:support Midrange adjustment:support adjustment:support frequency response:20Hz-20KHz Treble:10KHz ±12dB 220mV 47K :100Hz ±12dB 220mV 47K vocal tract:5.0 Output power:300W Bluetooth:support SD card:support reverberation:support remote control:support FM frequency range:87.5-108MHz Treble adjustment:support harmonic distortion: Less than 1KHz 0.05% 4W (The product printed words depending on the batch, but this does not affect use) Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the , the Philippines,Taiwan and so on. Voltage: AC110V Color: As Shown Material: Metal Package Contents: 1 * Sound Amplifier 1 * adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.