1. This amplifier board adopts ultra clear BT 5.0 and uses PAM8403 amplifier chip, which is suitable for DIY low-power wireless BT speakers. 2. Excellent noise suppression, dual channel stereo, 5W power output with 5V power supply, high output power, sufficient energy, and good sound quality. 3. Easy to use, can directly use the computer's USB power supply, high amplification efficiency. 4. Low power consumption and high efficiency, PAM8403 adopts Class D amplification technology, which can provide high efficiency while maintaining low energy consumption, suitable for portable devices. 5. Supports dual channel output, with each channel providing up to 5W of power, suitable for small speakers and headphone drivers. Product Name: BT Digital Amplifier Board Chip selection: PAM8403 Power input: 5V (Type-C) Audio input: BT 5.0 Number of channels: Dual channel Output power: 5W x 2 Appearance size: 40 x 40mm Color: Black Material: Metal+Plastic Package Contents: 1 * Bluetooth amplifier board 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.