Supports reading MP3 songs in TF card and U disk. Supports treble and master volume adjustment. Working voltage: AC 220V or DC 12~24V. With AUX audio input, can be connected to 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\" via Bluetooth. Click on the device with the pairing name \"SZM183\", the pairing will succeed automatically. The default mode is Bluetooth when it is turned on, and it can be played directly after successful pairing. Note: Some mobile phones will prompt you to enter the PIX code. You can enter \"0000\" at this time (if the phone supports the simple pairing function, you do not need to enter the PIN code). Plug Type: Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, United States, 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 shooting 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.