Mortein Fragrant Refill gives you smoke-free & safe night-long protection against mosquitoes whilst you sleep. This one refill provides up to 60 nights of undisrupted sleep, with no need of changing the refill on a daily basis. How to Use Remove the plastic cap of the liquid refill bottle. Screw the liquid refill bottle onto the heater by rotating in a clockwise direction. Pluf the cordless gadget (220 V) directly into a socket. Only use gadgte in an upright position. Where to Use For indoor use only. Use only in the vertical position