100W*2+200W 2.1-channel Bluetooth digital amplifier, dual-core TPA3221. Add power switch, safer; lossless components, better sound quality; independent tuning of high and low frequencies, more convenient.Quality first, exquisite materials.Dual core is more stable, using 2 for original-imported TPA3221 amplifier chips. TPA3221 chip audio power core, high efficiency, low power consumption, high-definition sound quality and comprehensive protection mechanism.XY-ST21PRO Bluetooth antenna interface, the first generation IPEX interface has been welded, and an external Bluetooth antenna can be connected.Note:self-assembly is required.Type:A:Bare boardColour:BlackMaterial:PlasticPackage Contents:1 * digital Audio power amplifier BoardOnly 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.