Fab 4 Electric Propagator is ideal for use on a window sill or table top for germinating seeds. Each of the 4 mini seed trays has a clear lid with adjustable vents. The heated base contains an 8-watt carbon fibre element. Non-thermostatic, it is designed to increase ambient temperature by around 8°C. Dimensions of each mini propagator: Length: 17cm (7?). Width 10cm (4?). Dimensions of entire unit : Length 38.5cm (15?). Width: 24cm (9.5?). Height: 17.5 (7?).