MXR Bass Comp Bundle PS A1 RB@+*Bundle offer comprising*, MXR M87 Bass Compressor, Effect Pedal, Compressor pedal for electric bass, CHT ""Constant headroom technology"" for clean and clear sound quality, Knobs for output, input, release, attack and ratio, LED chain with 10 LED for ""gain reduction"" display, Status LED, True bypass, Sturdy metal housing, Operated with 9 V battery or Dunlop ECB-003 AC adapter (sold separately, not included here), Rockboard Pedalsafe Type A1 Rockboard, Protective Cover, Suitable for Electro Harmonix Nano series and MXR effect pedals with standard housing with 1 input and 1 output jack, Suitable for most effect pedals with housing dimensions of approx. 110 x 60 x 32 mm, With base plate for mounting on Rockboard pedalboards with click system, Distance of QuickMount mounting holes (W x D): 51 x 102 mm, Protects effect pedals from dirt and weather influences, Protects settings from unintentional adjustment, Mounts effect pedals securely on RockBoard pedalboards, No permanent modifications required, Includes QuickMount pedal mounting plate type A for RockBoard pedalboards and spare screws