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.