Feature:1. Compact and light-weight design, not bigger than a hand of the adults.2. Built-in distortion effect.3. Designed with 3 adjuster: Volume, tone, gain.4. Designed with a clip on the back, easy to fix on belt, pocket or anywhere else.5. Powered by two AAA 1.5V batteries (not included).Specification:Features:Compact and light-weight design, not bigger than a hand of the adults.Built-in distortion effect.Designed with 3 adjuster: Volume, tone, gain.Designed with a clip on the back, easy to fix on belt, pocket or anywhere else.Powered by two AAA 1.5V batteries (not included).Diagram of amplifier:How to connect:Specifications:Instrument jack: 6.35mm mono socketMax.input level: -10dBInput impedance: 1M OhmHeadphone jack: 3.5mmLink jack3.5mm 4-pin socketLink input impedance: 100KLink output impedance: 10KPower: Two 1.5V AAA batteriesProduct size: 9.8 * 4.7 * 3.5cm / 3.9 * 1.8 * 1.4inProduct weight: 56g / 2ozPackage size: 12.6 * 7.6 * 3.8cm / 5 * 3 * 1.5inPackage weight: 91g / 3.2ozPackage List:1 * Headphone Amplifier1 * Connecting Cable1 * Converting Cable1 * User Manual(English & Chinese)Package List:1 * Headphone Amplifier1 * Connecting Cable1 * Converting Cable1 * User Manual(English & Chinese)