Features:   Excellent noise suppression, in the absence of circumstances connected to input audio ear close to the speaker can not hear any noise, two-channel stereo, 5V power supply can output 3W 3W power, can directly drive 4Ω, 8Ω small speakers, the output power large, full of energy, good sound quality. The unique non-LC filter Class-D digital power board can be directly used computer USB power supply. Double panel wiring, wiring properly resolve the ground potential caused by balance and inter-channel crosstalk, ultra-miniature design, can easily be placed in a variety of digital products within a small space, high amplification efficiency. All using the whole plate welding machine, welding quality comparable non-manual soldering iron!Description:Ultrafine size: 1.85cm x 2.11cmNote: The left and right channel output of the "negative" and can not be connected together, otherwise it will burn IC, and should be preceded powered speakers connected (load).Rated working voltage 2.5 ~ 5V, limit operating voltage 5.5V.Brand Name: PAM8403Model Number: PAM8403 module2 x 3W D Class: Efficient 2.5 ~ 5VPacking Included:1 pcs x PAM8403 Module