Vox Amplug 2 Metal - compact headphone amp with 6.3mm integrated jack for direct guitar connection, 3.5mm aux input for mp3 players, controls for chorus/delay/reverb, foldable jack plug, powered via 2x AAA batteries (for up to 15 hours). Dimensions: 86 x 31 x 80mm (WxHxD). Weight: 40g.