1. Supports reading MP3 songs on TF card and U disk; 2. Supports adjustment of treble, and master volume; 3. working voltage: AC 220V or DC 12 ~ 24V 4. With Auxiliary Audio input, can be connected to computer, mobile phone or CD 5. Digital amplifier, 400W maximum , can drive 4ohm 100 magnetic speakers;6 -input adjustable reverb microphone; Built in wireless receiver with Bluetooth and FM radio (1) how to connect to Bluetooth: Press the "MODE" button to switch the machine to Bluetooth status, open the Bluetooth mobile phone, search the Bluetooth device with the mobile phone, search for the product, and click the Bluetooth name of the product to connect. After completing the connection, you can receive the music played on the mobile phone. (2) Radio function operating instructions: 1. the radio antenna; 2. Press the MODE button to switch to radio status; 3. Press the play button to search the whole channel and automatically save the station; 4. Press the previous or track to switch to the or station Plug Type: EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. colour: black Material: metal + plastic size: 17x8cm Package Contents: 1 x amplifier board 1 x remote control 1 x plug 1 x Connecting line Notice: Turn off the small master volume before running the -on test. Then increase the volume slowly after on. If the sound is intermittent or the sound is hoarse and distorted during the process of increasing the volume, the speaker and amplifier do not match. Please use the small sound or change the package. The speaker is used. 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.