Motion sensor distance: The infrared device's detection range is 2 to 8 meters. The remote control distance in open areas is up to 280 meters, which can meet the needs of multiple locations.[Entry Alert] Homeowners or business owners can use the doorbell to be alerted when people enter or leave. Use it to detect visitors through the front or back door. The portable design is easy to install in homes, offices, shops, and can also be used for mailboxes, garages, entryways, and more.[Reduce Errors] By using the same frequency but different coding technologies, the error rate is only 1/10000, which can effectively prevent mutual interference and ignition failures with neighboring devices.[Call Ringtone] provides 36 different ringtone options, from melodies to a simple, basic buzz. Customize your doorbell sound to your liking whenever you want. With 4 volume control levels, you'll never have to worry about the volume.to lose the entry of a visitor or customer.[Wireless] Wireless wall mounting. The wireless doorbell sensor operates on batteries and a plug for quick and easy use.