INTRODUCING GUMBASS - An easy-to-play, ultra-compact fretless beech wood bass that uses a rubber band as a string. FUN & EASY TO PLAY - Press down on the upper/left portion of the rubber band with your left hand as if playing a guitar, then strum the lower/right portion with your right thumb! TURN IT UP - The Gumbass features a built-in amplifier and speakers, and can also be played through external speakers by connecting a ¼” instrument cable to the output jack. (Cable not included.) UNLEASH YOUR CREATIVITY - Express yourself and explore new musical possibilities by creating your very own sounds! Have fun singing and playing along with family and friends at home or outdoors - the lightweight, portable GumBass is the perfect instrument to bring camping to accompany your campfire singalongs! QUICK AND EASY SET UP - To assemble, simply unfold, attach rubber band, and position the piezo sensor by pulling its attached pin outward! Volume knob doubles as an On/Off switch for easy operation. Requires 2 x AAA Batteries (Batteries Not included).