2. One click alarm for emergency help, smart life graffiti app is compatible with smart phone push notifications, and receives alarm information from smart phone sensors anytime and anywhere. 3. the mini design has a wide range of applications. It is suitable for both the elderly and children, especially for with a gentle . There are no complicated operations or buttons. 1. Graffiti ZigBee hub wireless gateway is a necessary product of SOS sensor and various ZigBee intelligent products. It has been proved to be and control center of smart home. It plays an irreplaceable role in all ZigBee products and realizes the connection of all smart homes.After adding the hub to the Smart Life / Tuya app, just add the sensor to the ZigBee hub. 4. DIY compatible control: support the intelligent connection between DIY sensor and other intelligent devices to detect more intelligent scenes such as on / off, movement, water, fire and so on. 5. Emission frequency: 100dbm, battery powered; Wear it anywhere with a rope; Use with ZigBee gateway hub to define the working mode of the scene anytime, anywhere., Weight: 0.07495716908 Pounds, Manufacturer: Bortivier