Note: The smart ZigBee Tuya door sensor must work with Tuya gateway Hub which supports ZigBee protocol. It can't work without Tuya ZigBee intelligent gateway. Features: 1. Smart SOS Sensor: A Wireless Gateway Hub is a must to work with the SOS sensor, as well as a variety of smart products, which is proved to be the bridge and control center for smart homes and plays an irreplaceable role for all products and realizes the whole intelligent linkage of your house. Simply add the sensor into the hub after adding the hub into Smart Life App. 2. One click alarm for emergency help and Smart Life App compatible for smart phones push notifications by receiving the alarm information from the sensor on smart phones anywhere, anytime needed. 3. Wide applications with its mini design and fits for the elderly and children particularly by pressing it gently to send the emergency help. No complex operations and buttons. 4. DIY compatible control: DIY supported for the sensor to smart linkage to other smart devices, detecting opening/closing, movement, water, fire and more smart scenes. 5.100dBm emission frequency and battery powered; carry it anywhere you like with the rope, use with the gateway hub to define the working mode of the scenario anywhere from anytime. Specification: Material: ABS Wireless frequency: 2.4GHz Emission frequency: 10dBm Emission current: peak value 45mA, average1～2mA Quiescent current: 2～3uA Emission distance: 100m+Open space Battery: CR2032 Working temperature: -20℃-60℃ Working humidity: ≤95%RH non-condensing Color: white Packing included: 1 * SOS Emergency Button Sensor 1 * User Manual 1 * Needle Note: 1. Please allow 1-3cm 0.4-1.18" difference due to manual measurement and slight color variation for different display setting. 2. Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand.