From the leaders in Z-wave plus technology, the Ecolink Motion Detector allows you to improve the safety and security of your home and family easily and effectively. Built with premium components for better performance, these motion sensors provide instant and reliable performance as part of your security system. Ecolink is a leading developer of low power, highly reliable wireless solutions, including a wide range of intelligent wireless security, sensing and home automation devices. Dimensions: 3.5”L x 2.3”W x 1.8”H.