• Digital amplifier designed for karaoke with SD and USB inputs for media playback and MP3 functionality. • Compatible with DC12V and AC220V power inputs, suitable for various power sources. • Enhances audio output from microphones and music sources with effects like echo and reverb. • Caution label advises against removing the cover to prevent electric shock; no user-serviceable parts inside. • Karaoke amplifiers like this are commonly used in home entertainment setups and small venues. • Features Hi-Fi stereo output for quality sound reproduction. • Model BT-339A (also BT-339FM).