The Tuya ZigBee Hub is essential for SOS sensors and various ZigBee smart products, serving as the bridge and control center for smart homes. It plays an irreplaceable role in connecting all ZigBee devices. Simply add the Hub to the Smart Life/Tuya app and connect your sensors effortlessly for a seamless smart home experience. 2. One-click for emergency help. The Smart Life Tuya App is compatible with smartphone push notifications and can receive information from smartphone sensors anytime and anywhere. 3. Mini design, wide range of applications, suitable for the elderly and children, especially for sending first aid with just one click. There are no complicated actions or buttons. Specifications This product must be used with Zigbee Gateway (not included). Without Zigbee Gateway, it will not work. Battery: CR2032 (battery included) Working temperature: -20℃ -60℃ Operating humidity ≤ 95% RH (non-condensing) Transmission frequency: 10dBm Emission current: peak 45mA, average 1~2mA Quiescent current: 2~3uA Launch distance: 100m + (open space) Wireless frequency: Zigbee 3.0 Due to different batches, there may be differences in product appearance and printed text, which will not affect use Color: White Material: ABS Package Contents: 2*ZigBee Devices Button Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.