The Viper S is a 650 watt fog machine that is 120V. Its small size ( approx 14" L x 7" W x 7.5 Tall) makes it ideal for small tight areas and it's only 12 lbs. This machine is not battery powered yet can easily be carried. It has a 750ml fluid reservoir tucked underneath the machine’s body. It has variable output that can be finely controlled, down to a whisper of smoke. Uses water based fog fluid.