Highly versatile - accepts a choice of 5 drums Built in timer Variable speed control 6 to 60rpm Rotation speed: 6 to 60rpm Dimensions (w x d x h): 650 x 250 x 250mm Net weight: 6.4kg Electrical Supply: 230V, 50Hz, 50W The STR4 rotator drive unit is used in conjunction with a wide range of drums designed to take different sizes and types of vessels. The five drums are designed to give different mixing actions. Speed of rotation is variable from 6 to 60rpm for a range of mixing applications. For added convenience a built in analogue timer can be set from 10 to 60 minutes. Alternatively the unit can be set for continuous operation.