1. Audio : Support MP3, WAV, etc.2. Bluetooth function: Support pairing of external Bluetooth devices such as mobile phones for audio playback.3. External sound input: Support external input to the machine, amplified output.4. Memory card function: external TF card, support 32GB TF card.5. USB function: Connect USB (support 32GB) to read music, and set up family background music space.6. Volume adjustment: 15-level electronic volume adjustment function.7. Power-off memory function: memorize the state played the last shutdown.Hardware Parameters:Power: AC110V-250V(50HZ)Impedance: 4-8Output Power: 2x15WAudio S Ratio: 98dBFrequency Response: 20-20KHzInfrared Remote Control Distance: 10MBluetooth Distance: 10MProduct Size: 86 x 86 x 10mmInstallation: 86 Standard Colour:blackMaterial:ABS Package Contents:1 * Bluetooth AmplifierOnly 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia