Three replacement discs and two replacement bulbs for use with Zero In Flea Killer (product code ZER020). The unit, discs and bulbs are poison free, odourless and safe to use around children and pets. The 7 Watt heat lamp attracts fleas and lures them onto a sticky discs which they are then trapped on to. Quick and easy to set up, the discs simply sit in the base tray and the lamp gently inserts into the lid of the Flea Killer unit. Change sticky pads every 2-4 weeks as a fresh pad is more effective. For best results, place the unit on the floor near to where your pets spend a lot of time.