Mortein Deep Reach Mat provides you with a deep reach action proctecting you and your family from mosquitoes for upto 8 hours. It is effective against Dengue mosquitoes and provides a continuous protection by emitting high-quality, odourless protection. Use it in any internal room needing defense against flies and mozzies. How to Use Remove one mat from its packaging, then place it into the electric mat heating unit and switch it on. Close all doors and windows for 10 minutes for maximum effect. Where to Use For indoors use only