Digital Class-D stereo amplifier, suitable for Hi Fi, home theater systems and karaoke Bluetooth interface for streaming music from cell phones USB / SD slot for playing MP3 from a memory stick or card FM radio with connection for an antenna This compact, powerful stereo amplifier is characterized by great fidelity and is equipped with FM radio, MP3 player, and karaoke function. Ideal for use as a small home amplifier or receiver. In addition to 2 stereo inputs on the back, the amplifier offers USB / SD slots on the front for direct playback of MP3 files, an AUX socket and 2 front microphone connections for karaoke! Characteristics: Digital Class-D stereo amplifier, suitable for Hi Fi, home theater systems and karaoke Bluetooth interface for streaming music from cell phones USB / SD slot for playing MP3 from a memory stick or card FM radio with connection for an antenna Push buttons for operating the MP3 functions Karaoke capable with 2 microphone sockets and echo effect Separate volume, tone and echo controls for the microphones Bass and treble controls Clear, large controllers2 rear stereo RCA inputs, front stereo AUX socket Raw cable clamps for connecting the speakers Technical specifications: Musical performance 2x 50 watts max @ 4 ohms Impedance 4-8 ohms Distortion factor 76 dB Frequency range 20 Hz - 20 kHz Dimensions 25 (W) x 9.