Accurate & Fast Response - Temperature Range: -40°F-140°F/-40°C-60°C; Accuracy: 0.3°C/0.5°F. With built-in accurate and sensitive temperature sensor and refresh once per second to provide more timely and higher accuracy data. Wireless APP Control - Upgraded Bluetooth 5.0, 30m/98ft connection range(without obstacles). A thermometer can be connected to multiple phones and a phone supports multiple thermometers. The App supports iOS&Android with calibration, high/low temperature alerts setting, alert notification, data storage and graph. Data Storage & Sampling Interval - The max date storage is 30000 points. Hold data for 20 days if the sampling interval is 1min, 200 days for 10 minutes. Different sampling interval can be set.(10s/ 30s/ 1min/ 2mins/ 5mins/ 10mins/ 30mins) The saving data time will be different if you choose a different sampling interval. Waterproof & Cold Resistance - IPX4 rated protection, rust-proof and spill-resistant, available to use in refrigerators and other damp places, provide accurate data in cold and moist environments. Ideal for refrigerators, freezers, reptiles, food storage, greenhouse, laboratories, guitar, brewing and more. Energy Saving & Space Saving - You can enjoy 3-6 months of continuous use with two AAA batteries inserted. The compact size product with built-in magnet is easy to place in multiple locations or you can place it at multiple locations by the hanging hole.