The HOG 20 recharging portable amp runs on it's own power for at least 8 hours. Just plug it in to recharge. Its front panel features include Volume, Tone, and Overdrive controls. The rear panel has a 1/4" headphone out-jack. AND the Hog 20 sports 2 input jacks, 1 in the front and 1 in the back, so a guitar player and a harp player can team-up using just 1 amp! It's perfect for small gigs and street corners where you're may not have access to electricity.