How to change the battery on a Honeywell 5815 wireless door/window sensor

hi I’m Ellen with provincial security and today I’m going to show you how to change the battery in your Honeywell Wireless door or window sensor so first you’re going to locate the sensor that you need to change the battery in on the bottom there will be a small notch take a small flathead screwdriver or a butter knife will work for this too place it in the Notch and twist until the two sides separate Once you pull those apart the battery will be inside and then you simply just take out the battery put in the replacement and then reattach the front do that wait up to 24 hours for the battery message to clear off your keypad