Permethrin based smoke generators for use in controlling crawling and flying insects in difficult to reach places, grow rooms, empty glasshouses. You will need to ignite one unit for every 7.5 cubic metres of airspace in the room/house for Bed Bugs. You will still need to apply further insecticidal treatment if eggs are present as the smoke is not residual and any eggs will NOT be sterilised. We suggest applications of PestOFF Spray insecticide after the smoke treatment. Room must be vacated for 4 hours after the treatment. ADVICE SHEET INCLUDED (contains Permethrin Synthetic Pyrethriod Insecticide). Use with great care as the smoke can build rapidly. You MUST leave the treatment area before inhaling the smoke, which will pass through normal face masks. PestOFF Midi Fumer For insects use one unit for Flying insects in a room up to 10 metres x 16 metres (400 cubic meters).