Excellent Materials: Made of excellent materials, this trap is drop-proof, wear-resistance, no peculiar smell. No need to worry about transportation problems Safe and environmentally friendly: this trap has no radio waves or electricity, it contains no toxic substances. For pregnant women, children and pets are safe. Easy to use: you just have to put the bait, cover the lid and place the cockroach trap in a suitable place (e.g. in bathrooms, storage rooms, garages or behind fridges). The bugs will pass through the trapdoor for the biscuits and get trapped , The catched bugs will send out signals to lure more bugs in. Smart design: two sizes, Single Layer is about 14*14*4cm/5.51*5.51*1.57in Double Layers is about 14*14*7cm /5.51*5.51*2.76indesign with two levels of access control, so cockroaches can go into the trap, but cannot walk. Satisfactory Service: We are committed to ensuring that you are 100 satisfied. If you have any questions during the use, not satisfied with our products or services please contact us by email directly, we will try our best to provide you with satisfactory and friendly service.