Features: Experience unparalleled with our 5.8G Waved Radars Sensors of detecting human presences even when completely still, ensuring enhances safety and intelligent management. Featuring high sensitivity, strong without interferences capabilities, and privacy protective, this Sensors is designs for time monitoring in various complex environment. For intelligent home users, security systems integrators, office building managers, and enthusiasts seek advanced monitoring solution. Perfectly suited for applications such as intelligent home security, office personnel monitoring, public area safety management, and elderly care. Crafted from ABS materials, this Sensors integrates seamlessly into your existing electrical setups, providing high performances. Specifications: Component: ABS Type: As Picture Show, Two Type to Choose Size: Diameter 3.46cm/1.36inch Voltages: 9V-24V Package Includes: 1pc Human Presences Sensors note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.