Portable Guitar Practice AMP Amplifier Headphone Speaker 2 USA Totally portable amp solution.Volume and tone control. Belt clip.Bass to treble tone control. Drive switch - select between drive and clean sounds.No power outlet needed - takes a 9 V battery.Headphone socket. Color: Silver. Material: Plastic. Power: DC 9 V. Output Power: 1.3 W Battery: 6F22 Model (DC 9V, alkaline batteries, not included in the package) Input Socket: 6.35 mm. Speaker: 2 inches, 4 ohm. Weight: Approx. 180 g. Dimension: 14.0 (H) x 8.0 (W) x 3.5 (D) cm