Compact and efficiency design: The 3W+3W PAM8403 amplifier module is ultracompact, ideal for spaceconstrained electronics like portable speakers and mini PCs. It delivers 90% efficiency at 5V with no heat sink required, maintaining crystalclear audio during prolonged use. Suitable for DIY projects and compact device integration. Versatile power compatibility: Operates via USB 5V (computers/chargers) or lithium batteries (2.5V5.5V input), enabling flexible installation in automotive accessories, gaming setups, and mobile audio systems. Dualchannel output supports simultaneous connections to two speakers. Noise suppression and protection: Builtin protection and mute circuitry eliminate pop sounds during power cycling. Advanced shortcircuit and overtemperature safeguards provide stable operation for TVs, monitors, and multimedia devices. Plugandplay installation and speaker compatibility: Presoldered terminals simplify wiring for electronics enthusiasts. Compatible with 48Ω speakers, with 4Ω recommended, enhancing compatibility with bookshelf speakers and desktop audio setups.