Chip and power Uses a TPA3116 stereo amplifier chip. Maximum power up to 50W. With a 12V 5A supply, the actual output is 30W per channel into 4 ohms (30W x 2). Sound quality HiFi sound with clear, detailed audio. Low noise design that remains quiet even at higher output levels after careful circuit optimization. Audio inputs and compatibility 3.5 mm stereo input USB audio input Bluetooth 5.0 wireless input RCA input TF card input USB input (OTG capable) Can connect to computer, mobile phone, or OTG devices Practical use scenarios Home stereo upgrade: pair with two bookshelf speakers to create a compact hifi system using Bluetooth, USB, or 3.5 mm input from a computer or phone. Wireless music playback: stream audio from a Bluetoothenabled phone or tablet and enjoy clean, assured sound without noise. DIY audio projects and media centers: connect to a TV, CD player, or other RCA sources, or play local music via TF card or USB drive, enabling flexible multimedia playback.