Wireless Signal Transmission LCD Digital Alarm Refrigerator Freezer Electronic Temperature Monitor 1. Wireless signal transmission distance up to 100 meters without interference; capable of displaying two different maximum and minimum temperature records simultaneously. 2. Temperature unit conversion between Celsius and Fahrenheit is available; provides strong signal penetration. 3. Alarm settings: When the indoor or outdoor temperature exceeds the preset minimum or maximum alarm thresholds, the thermometer emits an audible and visual alert to notify you of necessary adjustments. 4. Easy to install and operate: Use the built-in magnet on the back to attach the thermometer directly to a refrigerator or freezer, or place it on a flat surface. 5. Application: Suitable for use in refrigerators, freezers, indoor, or outdoor environments to monitor temperature changes and help protect food quality. Parameters: Measuring range (transmitter): -40℃ to 60℃ (-40℉ to 140℉) Accuracy: ±1℃ (±2℉) Temperature resolution: 0.1 Wireless frequency: 447.6 MHz Wireless range: Up to 100 meters without obstacles Main unit dimensions: 95 x 62 x 20 mm Transmitter dimensions: 95 x 36 x 20 mm Power supply (batteries not included): Main unit: 2 x AAA batteries Transmitter: 2 x AA batteries Color: White Material: Plastic Package Contents: 1 x Thermometer (main unit) 2 x Transmitters Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting effects and display differences may cause slight variations between the product color in images and the actual item. Measurement tolerance is ±1–3 cm.