Tech 21 OMG, Richie Kotzen signature overdrive, tone control for the upper mids and highs, girth controller, specially designed active center controller, compatible with downstream stacks, drive simulates the distortion of a tube power amp, reacts strongly on the position of the volume pots guitar, boost the signal by up to 28db, can also be used without the overdrive section as amp booster, 100% analog signal path, sturdy metal housing and metal switch, no switching noise, power supply by 9V battery or by optional power supply (# 108096, not included), dimensions: 92 x 120 x 50mm, weight: 340g