Features: 1.Built-in 3.7V 300mAh rechargeable lithium battery, support up to 8 hours of working time 2.The red LED indicator indicates that the device is charging, and the green LED indicator lights up to indicate that the device is fully charged. Two indicator lights indicate that the device is fully charged, and one LED indicator means less than 75% remaining power 3.Headphone mini plug amplifier with distortion effect. Just plug music into the guitar, you can enjoy music at home or outdoors 4.Function knob can control tone, distortion, volume adjustment. The AUX in the jack allows you to use it with a mobile phone or MP3 player. There is a 3.5 mm headphone jack 5.The design is small and easy to carry. You can put in your pocket when you are out, plug and play. No matter where you go, you can play the guitar freely anytime specification:Item Type: Plug Amp Material: ABS + electronics Battery Type: 3.7V 300mAh rechargeable lithium battery Headphone Jack: Approx. 3.5mm / 0.1in Size: Approx. 8.3 x 7.9 x 2.8cm / 3.3 x 3.1 x 1.1in PackageList: 1 x Plug Amp 1 x USB Charging Cable 1 x Audio Cable