Weighing less than 5 pounds and powered by two 9v batteries or the Included AC Power Supply, this little guy delivers great tone through a single 5″ speaker. It also features onboard Volume, Tremble and Bass controls to fine-tune your sound. Use the built-in headphone jack for quiet practice sessions, it automatically bypasses the speaker. The Aux input is perfect for jamming along with tracks on your favorite media device (phone, mp3 player, iPod, etc.). For classic looks, this Kala amp comes dressed in a vintage-style tweed covering. Use it with your guitar, ukulele, or just as an MP3 Player, in any case you’re going to love this amp! Weighs Less Than 5 Pounds Includes Two 9 volt Batteries AC Power Supply Also Included Single 5″ Speaker Volume, Tremble and Bass Control Built-in Headphone Jack, automatically bypasses the speaker for quiet practice sessions Aux Input for phone, mp3 player, iPod, etc. Vintage-Style Tweed Covering