"Features:Portable and light-weight, easy to use and carry.Plug it in your guitar and enjoy the metal sound.6.35mm plug, just plug into guitar jack, no need of installation.""Phones"" jack to connect headphones, portable speaker, mixer, or recorder.AUX jack lets you connect an external audio device such as cellphone or MP3 player.3 adjusters: gain, tone, vol.Comes with a USB cable for charging.Specifications:Color: BlackMaterial: ABSPower Supply: Built-in rechargeable batteryWorking Current: 37mAItem Size: Approx. 7.5 * 7.5 * 1.2cm / 3 * 3 * 0.5inItem Weight: Approx. 33g / 1.2ozPackage Size: 14 * 11 * 2cm / 5.5 * 4.3 * 0.8inPackage Weight: 70g / 2.5ozPackage List:1*Guitar Plug Headphone Amp1 * USB Cable"