Honeywell Smart Security Access Sensors are easy to install and are capable of extending your security system. You'll receive alerts whenever windows or doors in the home are left open unexpectedly. Security Access Sensors include highly sensitive detection that's capable of identifying movement of less than one inch. The inclusion of tamper-proof smart technology will provide homeowners additional peace of mind. Longevity and peace of mind are assured as Honeywell Smart Home Security Access Sensors include a battery that lasts up to four years.