The E+ Indoor Door Window sensor is thoughtfully designed with a pre-included spacer, ensuring a seamless fit for the curves of most doors and windows. By bringing the magnet closer to the sensor, the new design effectively reduces false alarms, providing consistent performance. Intelligently crafted with a rounded outer and square interior, its versatile design enables quick and accurate installation, broadening its range to more door and window applications. Plus, with a battery life of up to 8 years, you can enjoy long-lasting operation.