Headphone preamp and acoustic simulator effect for guitar. 1/4" Guitar Plug. 3.5mm headphone output & 3.5 mm Aux input. Blend, Tone and Volume controls. Power indicator light. Simply connect directly to your guitar & headphones without disturbing others near you. Plug in your media player and play along to your favorite songs. Dimensions:79.5 x 75.5 x 15.5mm. Weight: 40 g. Controls: Gain, Tone, Volume. STANDBY/ON/FX switch. Terminals: Phone Jack/AUX In Jack.