The ALTA Wireless Digital Temperature Sensor produces and displays a thermistor-based temperature measurement and is available with multiple lead lengths.Key Features Measurement Range: -40 to 125°C (-40 to 257°F) Resolution: 0.1°C (0.18°F) Accuracy: ± 1°C (± 1.8°F) 4-digit display with Power and Read buttons Configurable thresholds for critical condition monitoring Wireless range of 2,000+ feet through 18+ walls 1 Frequency-Hopping Spread Spectrum (FHSS) Best-in-class interference immunity Best-in-class power management for longer battery life 2 Encrypt-RF Security (Diffie-Hellman Key Exchange + Advanced Encryption Standard (AES)-128 Cipher Block Chaining (CBC) for sensor data messages) Sensor logs 2000 to 4000 readings if the gateway connection is lost (non-volatile flash, persists through power cycling): 10-minute Heartbeats = ~ 22 days - 2-hour Heartbeats = ~ 266 days - Automatic over-the-air updates to sensor firmware (future-proof) Free iMonnit Basic Online Wireless Sensor Monitoring and Notification System to configure sensors, view data, and send alerts via SMS text, email, and voice call