Support reading MP3 songs in TF card and U disk. Support adjustment of treble, and master volume. Working Voltage : AC 220V or DC 12~24V With AUX Audio input, can be connected to the computer, mobile phone or CD. Digital amplifier, 200W. microphone input, adjustable reverb; built-in Bluetooth wireless Receiver and FM radio. How to Connect to Bluetooth : Turn on the subwoofer and search for the name "SZM183" by Bluetooth Click on the device with the pairing name "SZM183", the pairing is successful automatically The default is Bluetooth mode when on, and it can be played directly after pairing successfully Notice: Some mobile phones will prompt you to enter the PIX code. You can enter "0000" at this time (if the phone supports the easy pairing function, you do not need to enter the PIN) Plug Type: Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on. Colour: black Material: metal Size: 175x80x50mm Package Contents: 1 * amplifier board 1 * Plug 1 * Remote control 1 * Cable Only the above package content, other products are not included. Note: Light 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.