The Ak-55 Bluetooth 5.0 Hifi Stereo Digital Audio Amplifier Receiver, Us Plug. ? Upgrade Version AK-55 Digital Audio Amplifier? Fully updated design, 70W+70W rated power, perfect match for 6.5-10 inch passive speakers. Function upgrade, adding Mic, Echo Reverb Delay functions. Besides, as a digital amplifier receiver, the sound quality is more perfect than ordinary analog amplifiers, With built-in power transfer board which support AC 110-240V power input and DC 12V/5A power input, ready to use. ? HiFi Stereo Effect Amplifier Receiver? Dual channel bluetooth 5.0 stereo digital amplifier receiver can provides 600Wx2 P.M.P.O(Peak Music Power Output), with powerful audio processing chip, signal-to-noise ratio: 85db, strong anti-interference ability, shielding power inductance, low noise amplifier,HiFi sound quality which is is perfect for home theater acoustic sound system. ?Multiple Input Multipurpose? This home audio power amplifier, with Bluetooth, AUX, MIC, USB input, audio from external devices, such as CD, DVD, TV, PC, computers, tablets, notebooks, phones, MP3, and projectors with AV audio etc., great for home theater speakers system,TV audio, computer audio system. ?With Mic, Echo Reverb Delay Function? The home audio amplifier receiver with Microphone input jack, you can sing karaoke with families or friends at home, amplifier with Echo and Reverb Delay function, you will get more perfect HiFi sound quality output. Besides,The audio amp with FM Function, FM mode can set up more than 20 stations. ?Easy to Use? Bluetooth audio amplifier compatible with two 4-16? passive speakers. Power amplifier plifier with remote control for distant audio adjustments, can read USB MP3 player, support BT wireless connection, with US plug for easy to use.