The EZ-Find! transmitter is set to turn itself off after 2 minutes of non use. When the batteries in the EZ-Find! transmitter are low the display will begin to fade. The battery in each tag will only be consumed if the tag switch is turned on. If the tag is not being used, keep the tag switch in the OFF position to extend battery life. The tag battery has a low battery warning feature whereby the tag will beep every 5 minutes when the battery is losing power.