High-Performance Amplifier: Experience superior audio quality with the ZK-TB21 TPA3116D2, featuring a 2.1 channel configuration that delivers a powerful 50W x 2 + 100W output. Ideal for audiophiles seeking rich, dynamic sound. Advanced Bluetooth 5.0 Technology: Stream your audio seamlessly with the latest Bluetooth 5.0 technology. This amplifier board ensures stable and fast wireless connections with a wide range of devices. Enhanced Bass Control: Tailor your listening experience with adjustable bass settings. This amplifier provides deep, thumping bass, perfect for enhancing your home theater or audio projects. Versatile Usage: Suitable for various audio applications, from DIY projects to home audio systems and more. Its robust design ensures durability and consistent performance. Bluetooth version: 5.0 (unobstructed, 10 meters) Input sensitivity: 500mV Input method: AUX+Bluetooth Number of channels: 2.1 channels Amplifier chip: TPA3116D2 (with AM interference suppression function) Applicable power supply: DC 12-24V/5A or above (the higher the voltage, the greater the output power) Applicable speakers: 20-100 W, 4-8 Ω Output power: left and right channels ≤50w, subwoofer ≤100W Protection mechanism: overvoltage, undervoltage, overheating, DC detection, short circuit protection Due to different batches, there may be differences in product appearance and printed text, which will not affect use Colour:Black Material:plastic Package Contents: 1 x Subwoofer 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.