Feature:1. Helps to deliver high-quality guitar sounds, retaining the sound output of the guitar.2. AUX jack lets you connect an external audio device to this jack.3. Uses the headphone jack to connect headphone, portable speaker or mixer.4. Powered by the built-in battery.5. Designed with 3 knobs: blend / tone / volume knob.6. Comes with a USB cable for charging the item.7. Compact and light-weight design, not bigger than a hand of the adults.8. Comes with a USB cable for charging the item. Compact and light-weight design, not bigger than a hand of the adults.9. Designed with 3 knobs: blend / tone / volume knob. AUX jack lets you connect an external audio device to this jack.10. Powered by the built-in battery. Comes with a USB cable for charging the item.Specification:The headphone amp is compact and light-weight design, not bigger than a hand of the adults, easy to use and carry.Features:Helps to deliver high-quality guitar sounds, retaining the sound output of the guitar.Designed with 3 knobs: blend / tone / volume knob.AUX jack lets you connect an external audio device to this jack.Uses the headphone jack to connect headphone, portable speaker or mixer.Powered by the built-in battery.Comes with a USB cable for charging the item.Compact and light-weight design, not bigger than a hand of the adults.Specifications:Power Supply: Built-in 180mAh 3.7V rechargeable batteryWorking Current: 37mAItem Size: Approx.8 * 8 * 1.2cm / 3.1 * 3.1 * 0.5inItem Weight: Approx.33g / 1.2ozPackage Size: Approx.14 * 11 * 2cm / 5.5 * 4.3 * 0.8inPackage Weight Approx.70g / 2.5ozNote:The headphone is not included.Package List:1 * Headphone Amp1 * USB CablePackage List:1 * Headphone Amp1 * USB Cable