Internal high-quality Bluetooth-compatible module Adjustable high and low select different sound effects. Stable,low energy consumption, power saving, low heat generation, long service life. your devices while with dual USB ports. Support microphone output. Support: 220V 12V/24V Bluetooth-compatible Call: not supported FM Radio: support Channel: Mono stereo USB: Support Remote Control: support Bluetooth-compatible Version: 4.2 Bluetooth-compatible Music: support Microphone: support Bass Adjustment: support (The product appearance and printed words depending on the batch, but this does not affect use) Voltage: AC100-240V Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Color: As shown Material: plastic Package Contents: 1 amplifier board 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.