The Viper S is a high performance fog machine with a built-in timer and DMX. It has very smooth output even at low settings, and its small size and weight allow it to be installed in very tight spaces. Pump can be adjusted in increments of 1%-99%. Heat-up time is approximately 7 minutes. Continuous output when pump is set at < 50% and settings above 50% will yield a 35 second blast.