1. High power output: Using the TPA3251D2 chip, the output power can be as high as 220W+220W.TPA3251D2 is a high-performance Class D power amplifier with Class D efficiency and can bring true high-end sound quality. The device features advanced integrated feedback design and proprietary high-speed gate driver error correction function. This technology allows the device to maintain ultra-low distortion throughout the entire audio band while showing perfect sound quality. 2. Multiple inputs: Supports multiple connection methods such as Bluetooth, AUX and USB, and is compatible with devices.Among them, USB supports lossless audio formats such as MP3, FLAC,MAV, APE, etc. Sampling rate: 44100hz, bit rate: 1411kbps.It is very convenient to switch between input modes only through the main knob. 3. tone adjustment: The high and low bass can be adjusted separately to make the sound quality richer. 4. Fever materials, is in the details:T220HS Bluetooth amplifier board uses 4 TI NE5532 op amps (quiet as the , quality), and gold-plated sockets, good conductivity, high reliability, support replacement of pre-amplifier, and more playability. (Compatible with JRC5532DD), 8 large-capacity capacitors, 10 purple robe fever capacitors, digital amplifier special inductors and other fever materials are only to give you a good sound. 5. Support wide voltage input: Support DC 12-36V DC power supply, the higher the voltage, the greater the power.<br><br>6. Multi-function knob: Single click: Pause/play,Double click; next song,Three clicks: previous song,Four clicks: switch input mode,Five clicks: activate/disable APP function,Six clicks: restore factory settings,Long press: low power standby 7. This amplifier board does not come with power and audio cables, users need to purchase them by themselves. This amplifier board supports DC 12-36V DC power input. The minimum operating voltage is 12V and the maximum operating voltage is 36V. Three specifications of DC power adapters are recommended. Colour: Black Material:ABS<br><br>Package Contents: 1x Bluetooth amplifier board<br><br>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.