1.AK45 Home Audio Power Amplifier: Fully updated design, 40W+40W rated power, 2.0ch, perfect match for 4-8 inch 4-16Ω passive speakers. Function upgrade, with Treble and Bass key, adding Mic Jack and Mic VOL key. 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 2.HiFi Stereo Amplifier: 2.0 channel digital amplifier can provides 400Wx2 P.M.P.O(Peak Music Power Output), with powerful audio processing chip, distortion Rate: ≤0.5%, signal-to-noise ratio: 85db, strong anti-interference ability, shielding power inductance, low noise amplifier,HiFi stereo sound effects, you can experience the effect of immersive 3.Bluetooth 5.0, : This AK45 home audio amplifier built-in Bluetooth 5.0 chip, supports wireless connection between audio devices and amplifiers, lossless sound quality and convenience. Mini power amplifier with remote control for distant audio adjustments, you can switch 6 different equalization effects built-in the player. With US plug for easy to use,great for home theater system use 4.With Mic & FM Function: The home audio receiver amplifier with Microphone input jack, you can sing karaoke with families or friends at home, amplifier with Treble and Bass 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