Add depth to your guitar's sound with the Electro-Harmonix Holy Grail. The all-metal stompbox construction of this Electro-Harmonix guitar effect pedal makes it durable. With three knobs - blend, amount, and reverb type, this reverb guitar pedal enables greater tone-weaving versatility. This nifty Electro-Harmonix guitar effect pedal allows you to choose from three different reverb types - room, hall, and spring reverbs. Adding to its ease of use, this reverb guitar pedal has a LED that indicates whether the pedal is in use or is being bypassed. The tonal versatility and operational ease make the Electro-Harmonix Holy Grail indispensable in any rig.