Upgraded Version Digital Audio Amplifier Fully upgraded design, 40W+40W rated power, perfectly suitable for 4-8 inch passive speakers. Function expansion, adding a microphone jack. Besides, as a digital amplifier receiver, the sound quality is more perfect than ordinary analog amplifiers. With built-in power transmission board that supports AC 110-240V power input and DC 12V/5A power input, ready to use Bluetooth 5.0 The receiver has a built-in Bluetooth 5.0 core and a powerful audio processing chip. Distortion rate: 0.2%, Signal to noise ratio: 95db. No crackling or noise when connected via Bluetooth. Please keep a distance of 10 meters between the device and the amplifier without a wall in the way. Please keep a distance of 5 meters if you want to connect to a TV or computer HiFi Stereo Effect Amplifier Receiver 2.0 channel bluetooth 5.0 stereo digital amplifier receiver can output 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 sound effects, you can experience the effect of immersive Multiple Input & Multipurpose This frequency amplifier can input audio from external devices such as CDs, DVDs, TVs, PCs, computers, tablets, laptops, mobile phones, MP3s and projectors with AV audio. Ideal for use indoors and outdoors, in the car, in the classroom and at parties BASS & TREBLE CONTROL Mini Bluetooth stereo audio amplifier receiver with volume, treble and bass controls for finer adjustment of the sound. A controller is included in the package that can be used to adjust the sound remotely. There is an insulating plastic part on the bottom of the remote control that must be removed before use USB 2.0/SD The sound amplification mixer device has a USB/SD card input that can support flash drives or SD cards. Allowing you to play your favorite audio files from the computer's media library when you connect the computer directly to the amplifier Bass and Treble Control Designed with volume, treble and bass control knobs, you can adjust the sound more finely, which is very interesting and playable. Includes a controller for remote audio adjustment. Note: There is an isolation plastic sheet at the bottom of the remote control, which needs to be removed before use With microphone 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 get more perfect HiFi sound quality output. In addition, the audio amplifier with FM function, FM mode can set up more than 20 stations