Designed for multi-cat households, the SureFlap DualScan Microchip Cat Flap reads your pets microchip on the way in and out of the house. The DualScan cat flap allows you to set permissions for each pet, keeping certain cats inside whilst allowing others to come and go. As an animal approaches the cat flap scans for a microchip or collar tag and if an authorised pet is detected the door unlocks. The safety mode means that indoor pets can still gain entry if they escape through an open door or window. The cat flap can store up to 32 pets. Ideal for multi-pet households. For glass installations a SureFlap Cat Flap Mounting Adaptor is required.For wall installations a SureFlap Cat Flap Mounting Adaptor and SureFlap Cat Flap Tunnel Extenders may be required.These accessories are not included with the product and must be purchased separately. Compatible with all microchips or the SureFlap RFID Collar Tag (sold separately) Simple one-button programming DualScan Technology - keeps intruders out and allows you to control who can leave Safety mode - indoor pets can gain access if they escape through an open door/window Can be installed in doors, windows and walls (accessories may be required) Stores up to 32 pets Battery powered - 4 x AA batteries which will last up to 12 months with normal use Four-way manual lock - can be used to keep programmed pets in or out Low battery indicator light Measurements: Flap Dimensions: Width: 142mm Heaight: 120mm Installation/Hole Dimensions: Width: 165mm Heaight: 171mm