The Bluetooth Stereo Amplifier adopts performance 2pcs texas instrument TPA3116D2 amp chip, dual-channel max output power 50W x2 +100W to get clear audio sound, no pop, no audible noise, dead silent when nothing is playing through it Speakers full frequency output, By using the custom treble bass knob and adjustable 40-300Hz cutoff frequency for the subwoofer, you'll be able to get the best sound Supports wireless playback from Bluetooth devices, Bluetooth 5.0 wireless music streaming technology with external antenna make a transmission distance of more than 15m/49ft Full metallic shell to ensure high quality and durable, advanced circuitry design, built-in speakers protection circuit to ensure Hi-Fi clear and clean sound; With unrivaled sound for the customers who pursue HiFi sound Upgraded DC power outlet for safe use without sparks, included high quality 24V/4.5A power supply (The plug of the power adapter will match the country of your delivery address) enough to drive most passive speakers and powered/passive subwoofer.