R-27 is specially designed for bass, offering types of bass compression via the 3 knobs. The TONE knob retains note clarity and makes the tone stand out during live performance, a great for modern style bass players. Its circuit is designed to feature low noise high dynamic control range, anyway, a studio-grade pedal. InputImpedance:1Mohm Output Impedance:100ohm Current Consumption:90mA Working Voltage:DC 9V(center minus) Weight:234g Model:R-27 Purchase Note: 1. Before you test the pedal or before playing, make sure the guitar is fully connected with the pedal; 2. More importantly, you need to make sure it meets the working current requirement of each single pedal. 3. In order to make for pedals work properly, avoiding unexpected noise caused by power supply, we recommend that you purchase a for power adapter Colour:Red Material:Metal Size:109x72x48mm Package Contents: 1 * Guitar Pedal 1 * English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.