Feature: 1. Helps to deliver high-quality guitar sounds, plus a digital delay effect. 2. Designed with 3 knobs: echo/ F.back / time knob. 3. AUX jack lets you connect an external audio device to this jack. 4. Uses the headphone jack to connect headphone, portable speaker or mixer. 5. Powered by the built-in battery. 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. 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, plus a digital delay effect. Designed with 3 knobs: echo/ F.back / time 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 rechargeable battery Working Current: 80mA Item Size: Approx.8 * 8 * 1.2cm / 3.1 * 3.1 * 0.5in Item Weight: Approx.38g / 1.3oz Package Size: Approx.14 * 11 * 2cm / 5.5 * 4.3 * 0.8in Package Weight Approx.74g / 2.6oz Note: The headphone is not included. Package List: 1 * Headphone Amp 1 * USB Cable Package List: 1 * Headphone Amp 1 * USB Cable