Feature: 1. Auto On and Off: Our guitar effect pedal will automatically turn on the pedal when you plug in the socket and off when you unplug the socket with a bypass switch. 2. Two Power Supply Methods: You can power it by battery or DC power supply. When you plug in the DC power adapter, it will be powered by DC power automatically. When you unplug the DC power supply, it will be automatically powered by the battery(not included) and can be connected to any guitar power source. 3. Blue LED Lights: This guitar effect pedal is specially designed with two blue LED lights. It looks very cool when you use it and adds a lot of fun to the process. 4. Powerful Performance: This guitar effect pedal allows for a very powerful sound and more signal. It also supports harmonic enhancement, and has the ability to do large distortion, fuzz and boost signals. 5. Applicable Scenarios: The guitar effect pedal is suitable for bass and guitar, suitable for playing metal or rock music, if you happen to have related needs, then this one is for you. Specification: Item Type: Guitar Effect Pedal Model: BS1 Material: Aluminum alloy Working Voltage: DC 9-12V Current: 200mA Two Kinds of Power Support: Battery or DC input Battery: 9V lithium battery x 1 (shipped without battery). Package List: 1 x Guitar Effect Pedal 4 x Foot Pad1 x Instruction Manual