Pyle-Pro PPDLCS Compressor Sustainer Effect Guitar Pedal Get Super-Smooth Compression And Endless Sustain - Runs On 9 V Battery or The DC Power Supply (Not Included) Dedicated Level, Tone, Attack And Sustain Controls For Awesome Sound Shaping - High-Quality Components And Exceptionally Rugged Construction To Ensure Long Life First-Class Electronic On/Off Switch For Noise-Free Operation - Dimensions: 4.9D x 2.76W x 2.12H Compress Loud And Boost Low Signals Without Degrading The Original Sound Status LED For Effect On/Off And Battery Check Get Super-Smooth Compression And Endless Sustain - Runs On 9 V Battery or The DC Power Supply (Not Included) Dedicated Level, Tone, Attack And Sustain Controls For Awesome Sound Shaping First-Class Electronic On/Off Switch For Noise-Free Operation - Dimensions: 4.9"D x 2.76"W x 2.12"H Compress Loud And Boost Low Signals Without Degrading The Original Sound Status LED For Effect On/Off And Battery Check