The Zoom B1X FOUR Bass Multi-Effects Pedal takes your low-end to new heights with over 70 effects and amp models, looper and a built-in rhythm section. Play your bass to 68 different drum patterns! The B1X FOUR series offers a built-in drum machine with a variety of rhythm patterns in 4/4, 3/4 and more. Plus, access ZOOM Guitar Labs additional library of downloadable effects, FREE. ZOOM Guitar Lab offers an endless world of patches, effects and more. And with its ability to manage and backup all of your patches, you can experiment with endless combinations. Craft your signature sound with more than 60 traditional and boutique effects, such as octaver, bass synth and fuzz. For added control, the B1X FOUR features an expression pedal that can adjust effects, such as volume, wah, delay and pitch. The B1X FOUR can operate with four AA batteries. You can also use an optional Zoom AD-16 AC adapter or run your pedal via USB bus power.