Feature:1. The LED power indicator clearly indicates the working hours, avoiding the worry of insufficient power.2. Compact and lightweight design, easy to carry, easily fit into your pocket.3. Heavy metal tones, builtin distortion adjustment knob, volume adjustment knob.4. Use the earphone cable to connect the MP3 audio device and the amplifier, and then plug the amplifier into the loudspeaker.5. Built-in polymer lithium battery 500mAh, charging time is only about 1~2 hours.Specification:Item Type: Guitar Headphone AmplifierMaterial: ABSColor: As shown in the pictureBattery: Polymer lithium battery 500mAh(Built-in)Current: Maximum 20mahRegulator: 3 modules in total: driver, tones, and volumeCharging Time: About 1~2 hoursWeight: Approx. 101g / 3.6oz.Package List:1 x Headphone Amplifier1 x Audio Cable1 x USB Power Cable1 x Headphone Adapter