I bought this new and used it only once. The amplifier itself is producing noise. At low volumes, the sound is scratchy. At a reasonably high volume, it plays without scratching. The remote control is unopened, so its operation is unconfirmed. It basically works, but there is noise and scratchiness at low volumes. 1000W Max Output: The Donner stereo receiver elevates your audio experience with a 1000W max output (25W x 4 RMS power, please make sure the speakers you use match the RMS power output of this amplifier!) and a simple appearance. It independently controls 4 channels and supports up to 8 speakers in 4 groups with 4-8Ω impedance. Multi-function Remote Control: Without the limitations of a single function, our amplifier home audio allows you to use the treble/midrange/bass/echo/talk-over setting functions in any input mode. An upgraded remote control is included (Note: Even if you turn off the amplifier with the remote control, the power will not be turned off. To avoid hum noise, please turn off the power with the main unit's on/off button after use). Multi-Input Mode: This audio receiver supports various sound source inputs, including Bluetooth 5.0, USB (up to 64G), 2 sets of RCA, 2 microphone inputs, AUX IN, and FM radio. In addition, digital fiber and coaxial interfaces have been added (Please use an optical audio cable for connection to the optical port), making it compatible with most smart TVs. Custom EQ Control: Both the Bluetooth amplifier and the remote control can independently control the treble, midrange, and bass adjustments, allowing you to set the sound as you like. Dual Microphone Interface: Equipped with dual 1/4'' microphone jacks, it is perfect for karaoke parties. In addition, the talk-over function allows you to lower the BGM and output clear sound in events, emceeing, speeches, and other situations.