Standard Sensor:

Both the sensor and monitor use a single CR2032 coin cell battery, which is available at your local grocery, home improvement, electronics stores, and many online stores.

You can easily open the devices by inserting a narrow object such as a screw driver or butter knife into each side and popping open. Below is a video showing replacement of the sensor battery. Also below are links showing diagrams of each unit with arrows showing where you must pop open the device.

Sensor Diagram

Receiver/Monitor Diagram

XL Sensor:

The XL sensor uses a single CR2450 coin cell battery, available at your local grocery, home improvement, electronics stores, and  many online retailers.

The XL sensor has a sealed battery door, that rotates to open.

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