It means that you should soon replace the battery of your wireless switch. A wireless switch battery is a CR2032 button cell battery with a lifespan estimated to be 8 years. When you need to replace it, you will receive an alert on your smartphone. The indicator light on your wireless switch will also start to flash red when being used. We recommend that you change the battery within three months. To replace it, remove the plate and follow the directions to disassemble your wireless switch as explained in the instructions.