1The effect pedal has 7 different modulation effects, producing various special sound effects. 2Produce multiple excellent sound effects in one pedal, while still having the ability to customize effects. 3The volume and delay time can be adjusted, and the clarity of the imitated sound can be adjusted to achieve the desired sound quality effect. 4The pedal is small in size, easy to carry, and can save space when installed on the guitar. 5The aluminum alloy shell is sturdy and durable to avoid impact or wear caused by improper use. Item Type: Effect Pedal Material: Aluminum alloy shell Power: 9V DC center negative Current Consumption: 135mA Size: Approx. 11.2 x 6.4 x 3.4cm / 4.4 x 2.5 x 1.3in 1 x Guitar Effect Pedal 1 x Effect Pad 1 x English User Manual This product needs customers to purchase an external power supply by themselves before they can be powered on.