The Mooer Audio Shim Verb has three Reverb Modes - Room, Spring and Shimmer - and comes in a compact metal shell. Room gives you different sized true acoustics reverb, from room to hall. Spring simulates a classic spring reverberation, and gives you a vintage 60s surf sound. The Shimmer mode adds rich overtone into the reverb sound, spacey, smooth and shining, and popular in Post Rock music. The Shim Verb also has true bypass.