Despite its mini size(can be hold with one hand), the output power is improved to 100W(50Wx2) with the upgraded chip TPA3116. Supporting AUX/USB/Bluetooth input. You can enjoy your music in different ways. The Bluetooth function is also upgraded. Now it is more stable and faster. We need to mention that with the USB input, music can be played losslessly(Like connecting with a computer. By the way, you don't need to install a driver). You be surprised by the sound quality. Bluetooth Connection Distance: 10 meters or less Bluetooth Version: 5.0+ Rated Power: 50Wx2 Channel: 2.0 Impedance: 4-8 ohms AUX Input: 3.5mm stereo Power Supply: DC9V-24V DC 12V/5A Power Supply(Need your own choice to buy) Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Color: Black Material: plastic Package Contents: 1 x Amplifier 1 x AUX Input Line 1 x USB Cable 1 x Audio Cable(without power supply) 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.