Ecolink WST-232 Wireless Door/Window Sensor
When it is time to replace the battery in your door/window sensor, you will see an alert on your system panel.
The Ecolink WST-232 door/window sensor requires a 3-volt lithium CR2032 battery, which can be purchased from Indiana Alarm, local hardware store, mass retailer, or battery store.
1. Slide the top cover to disengage it from the sensor, then remove it to reveal the battery. (Removing the cover will trigger a zone tamper signal to the control panel.)
2. Replace with a CR2032 battery ensuring the + side of the battery faces towards you.
3. Re-attached the cover, ensure the Top (as marked on the inside of the cover) points away from the battery. You should hear a click when the cover engages properly.