Feature: 1. The product has four tones of unvoiced tones, overload tones, distortion tones, and metal tones 2. Preamp effect make your soul happy, whether you are in the bedroom, studio or on the stage 3. The preamp effector minimizes tonal loss to maintain the best sound quality, very useful 4. Adopt good quality aluminum material, light weight, possess good strength and good corrosion resistance 5. Pre amplifier pedal come with stable structure, excellent performance and long service life Specification: Item Type: Preamp Effect Material: Aluminum Color: Black Standard Input Level: -20dBu Input Impedance: 1MΩ Standard Output Level: -20dBu Line Output Impedance: 1KΩ Headphone Output Impedance: 10Ω Recommended Load Impedance: 10kΩ (or 32Ω earphone) Current: 100mA Built in Battery: 3.7V 650mAH lithium battery. Package List: 1 x Preamp Effect1 x User Manual Note: Do not connect this equipment to the same socket with electrical appliances with inverter control and electrical appliances with motors (such as refrigerators, washing machines, microwave ovens or air conditioners).