Review on SereneLife PAMP1000 - Stereo Power Amplifier with Digital Dual Channel Amp Design, Built-in Circuitry Protection, Stereo/Bridged Mode Selector, Auto System Activation & Compatibility for External Devices by Janet Harris

It's just not a very good amp, even for the money. The auto-sensing circuitry is so poorly implemented that it renders the amp almost unusable. If you find yourself missing the first two or three seconds of audio as it "feels" input, then decides to turn it on, or decides the quiet parts of what you're hearing shouldn't be boosted , and turning these off are handy things in an audio amplifier, then this might be what you need. As an added bonus, it's underpowered and the output toggle buttons look like they came off a Fischer Price toy.