Features: Monitor temperatures remotely with WiFi enabled small alerts featuring 40°F to 257°F range, Tuya/small compatibility, and fast push notifications for out of range conditions. Equipped with a waterproof external probe, real time data updates, and double power option (5V adapter + 6 hour rechargeable backups battery) for uninterrupted temperature logging in harsh environments. Ideal for homeowners, lab technicians, and commercial facilities requiring precise climate control in refrigerators, freezers, rooms, or industrial storage units. Securely install via magnetic back or adhesive to monitor HVAC systems, serum storage, food supply chains, or small homes automation setups triggering /heaters via presets rules. Export historical temperature records in ℃/℉ with calibration tool, seamlessly integrating with Tuya ecosystem devices like small plugs and thermostats for energy efficient automation. Specifications: Material: ABS Equipment size: 90mm×63mm×25mm/3.5x2.5x1inch Voltage: 110 to 250v Working voltage: 5V1A Product power: <5W Built-in rechargeable battery: 3.7V600MA Battery standby time: 4 hours Alarm indication: digital tube or display screen blinks and beeps Distribution internet indication: green indicator light blinks Detected surrounding temperature: -20C--+80°C Detected environmental humidity: 0%-100 percentage (no condensation) Temperature and humidity measurement accuracy: 0.5℃: 1% Measurement error: ±1°C: ±3% WIF band: 2.4G Package Includes: 1 set thermometers Detector note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.