Features: 3 in 1 smart sensor can detect real-time temperature and humidity indoors; light intensity detection helps you feel the environment change. Compatible with 'Smart Life' APP, can be easily controlled by mobile APP anytime anywhere. A smart ZigBee gateway is required for using this product, please prepare one by yourself. Compact size, light weight and concise appearance. With foldable bracket, double-sided sticker and magnetic sticker, it can be placed on desktop or be stuck on wall surface/ fridge. Easy to use, can be widely used in living room, bedroom, baby room, office, warehouse, greenhouse, wine cellar, shop, restaurant and more indoor places. Intelligent linkage scene: add more than one device in APP by turn, creating intelligent scene to control smart home more flexibly. Note: Size and color may be slightly different due to manual measurement and different light conditions. Thanks for understanding. Specifications: Color: White Material: ABS Temperature Measurement Range: 0~50 Accuracy: 0.3 Humidity Measurement Range: 0~99% RH Accuracy: 3% RH Light Intensity Detection Range: 0~999Lux Accuracy: 0.01Lux APP Download: Compatible with 'Smart Life' Built-in Battery: 1 * 3V CR2032 Button Battery Item Size: 66 * 66 * 10mm / 2.60 * 2.60 * 0.39in Item Weight: 28g / 1.33oz Package Size: 7 * 7 * 2.6cm / 2.76 * 2.76 * 1.02in Package Weight: 56g / 1.95oz Package List: 1 * Temperature & Humidity Sensor 1 * Double-sided Adhesive Tape 1 * Magnetic Adhesive Tape 1 * User Manual (English)