[REQUIREMENT FOR USE]: As the accessory of Linkind Home Security System, it MUST BE EQUIPPED with LINKIND Siren Hub (in Security Kit) or LINKIND Mini Hub to get it work: Siren Hub for home alarm system and smart lighting, Mini Hub only for smart lighting. Connected devices sold separately. Compatible with Alexa Echo (only 4th Gen), Alexa Echo Plus (1st Gen, 2nd Gen), Alexa Show (only 2nd Gen), Alexa Echo Studio if you don’t have a Linkind Hub. NOT comptatible with Echo dot..[SENSING CAPABILITY]: Monitor the movements in a width of 110°, a range of 16 feet (without obstructing objects). Send alerts to AiDot APP and trigger the Siren Hub (SOLD SEPARATELY) to sound deterrent alarm once the motion is detected. Will not disturb the signals around..[AUTOMATIC LIGHTING]: Combine the motion sensor with LINKIND Zigbee Lights (SOLD SEPARATELY and LINKIND HUB REQUIRED), make your lights turn on automatically when you enter the room, or turn off when you leaves. So much more to be explored on AiDot APP..[COMPACT AND EASY TO INSTALL]: Extremely space-saving and unobtrusive to be placed on the wall. Adhesive tape and mounting bracket available for easy installation. Needed to be placed 8-9 feet off the floor for better detection..[ANTI-TAMPER DESIGN AND BATTERY]: The sensor features an anti-tamper alert on the APP if intentional removal of the device occurs. 3V replaceable lithium battery is included and has a lifespan of up to 2 years. Remember to pull out the plastic partition before use.