Hog 30 Watt Rechargeable Portable Amplifier Designed with bass, acoustic guitar and keyboard players in mind, the HOG30 front panel features volume and master volume controls, separate treble, mid and bass controls, as well as a Funk Bass switch for extra punch and depth. Rear panel features include headphone and line out jacks. The HOG30's batteries will provide hours of portable playing, and playing through headphones will extend the time between recharges even further. Includes the Rechargeable battery.