The PE3W-BT portable Bluetooth amplifier's slim design enables it to be mounted in small spaces and deliver quality sound. The NSIWAY NS4250 Class D Stereo amplifier board puts out 2 x 3 watts @ 4 ohms and can handle up to an 8 ohm load per channel. Its small size can be mounted in small toys, ornaments, small displays, and music boxes with unbelievable sound for its size. It can turn small forgotten about bookshelves speakers into great sounding, portable Bluetooth speakers.