The HOG 30 is a recharging amplifier, it is perfect for outdoors speaking engagements, practice sessions and for playing loud clean sounds virtually anywhere. While it was originally designed for use with electric guitars & keyboards, it will work very well with any electric instrument and /or microphones, and can amplify radios, tape players or audio CD players. You can connect multiplies of these units together in series for an even better sound. You won't believe the amount of sound these amplifiers produce! And for a price everyone can afford ! Battery and AC operation. Includes AC adapter/battery charger. Rechargeable Batteries Included. Heavy Duty 8inches speaker. Funk Bass switch. Compressor/limiter. 2 inputs. 3 band EQ. Level and Pre Gain controls. Line Out jack. Headphone jack For private listening!. Approx. dim: 131/2 in.x 91/2 in.x 17 in. Renowned Pignose quality! RUNS FOR HOURS ON A SINGLE CHARGE