Mini preamplifier with impedance matching function for acoustic guitars. Supports 2-band EQ(BASS & TREBLE) and volume adjusting. 6.35mm plug for connecting musical instrument and 6.35mm output jack for connecting guitar amplifier. It can also turn your home stereo into a guitar amplifier, allowing you to experience the pleasure of music performing. Compact size, and , convenient to carry around. Power Supply: 1 x 3V CR2032 battery(not included) Colour:Red Material:Aluminum alloy Package Contents: 1x Guitar Preamplifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.