Power input and compatibility This amplifier module uses a terminal block and a DC 2.1 mm socket for power input. It works with most laptop power ports and directly connects to 5.0 V, supporting various speakers. Inputs and speaker compatibility Equipped with stereo input; supports speakers with power ratings of 20 W, 30 W, or 50 W. Compatible with speaker impedances from 4 to 8 ohms. Userfriendly design The knob potentiometer allows easy adjustment of power and settings. Conveniently turn the power ON and OFF, and manage V and V levels without complexity. Robust protections Builtin protections for reverse connection, overvoltage, undervoltage, over temperature, and short circuit. Selfrecovery overheating protection enhances durability. Use scenarios DIY powered speaker builds or compact stereo systems for home or workshop setups. Desktop or home office audio enhancement, integrated with computers or media players. Small classroom, meeting room, or event setup where a compact PA solution is needed for 4–8 ohm speakers.