ELK 6020 Wireless Two-Way Slim Line Door and Window Sensor, White

Slim wireless door and window sensor designed for reliable perimeter protection. Features two-way wireless technology for enhanced communication with compatible transceivers. Includes one built-in reed switch and front/back tamper detection to alert you to unauthorized access attempts. Compact design fits seamlessly into any décor. Available in white and brown finishes to match your home or business aesthetic.