Note: It's a ZigBee product that requires a ZigBee gateway(Hub) to use!!! Tuya Zigbee Temperature and Humidity Sensor Indoor Wireless Monitor, Battery Powered for Alexa Monitoring System describe: This product adopts the emerging zigbee technology and professional manufacturing process, it is integrated development experience for many years. This product can support mobile phone APP through the zigbee technology control temperature humidity sensor intelligent linkage device. Temperature humidity sensor is small in size, light weight, simple to use and convenient to carry, let you the parents enjoy the smart home brings the infinite fun! [Intelligent Linkage Equipment] [Real-Time Temperature And Humidity Change Perception] [Abnormal Temperature Humidity Emergency Alarm Push] [History Records Tracking] [Ultra-long Standby Time] Product name: Temperature and humidity sensor Product model: IH-K009 Battery type: CR2450 Temperature detection range: -10 x ~50 Temperature detection accuracy: 0.3 Humidity detection range: 0%~95%RH (no condensation) Humidity detection accuracy: 3% Wireless protocol: Zigbee Product size: 40x13mm Product weight: about 13g color: White material: plastic Package Contents: 2 x Tuya ZigBee Temperature Humidity Sensor 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.