TX-E201—Battery Replacement

The TX-E201 door/window sensor requires a CR2032 3-volt lithium battery, which can be purchased at your local hardware, mass retailer, or battery store.

Interlogix TX-E201 / Ecolink WST-201 Mini Door Window Sensor:

In order to replace the CR2032 3V lithium battery for replacement, slide down the back cover to remove it as shown below.