This easy to program cat flap is suitable for up to 40 micro-chipped cats. Reinforced, dual auto-latch with 4-way manual lock. Requires 4 x AA Alkaline batteries, Has a low battery indicator. Comes with a quick start guide and cutting template. Fits most wooden doors, walls (using optional tunnel extension), glass windows and glass doors. Single or double glazed door fitment requires installation adapter. Suitable Glass Cut-out Size: 212 - 285mmÂ°. White cat flap.