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ALTA – Open/Closed Sensor, AA


Perfect for monitoring the open or closed status of a window or door. Suitable for monitoring property door and window access, freezer and cooler doors, shipping cargo doors, restricted area doors.


With industry-leading range, security & affordability, Monnit’s ALTA range of remote wireless sensors has set new benchmarks. Since their introduction in 2017, Monnit’s ALTA Sensors have been global game-changers for many industries including Food Service, Facility Management, Manufacturing, Logistics, Pharmaceutical & Medical.

This Open-Closed sensor is perfect for monitoring door or window statuses. The sensor uses an external magnetic switch and trigger magnet to detect status—when the magnets meet, a door or window is closed. The sensor can also be configured via iMonnit software to only send notifications during specific dayparts (such as after-hours). Data also sheds light on access patterns—a boon for the foodservice, healthcare, and hospitality sectors.

The sensor can be used in various applications such as restaurant walk-ins, vaccine fridges or retail. If the something has been left ajar or has been accessed when it shouldn’t have, these sensors instantly alert you via text, email, or call for swift correction.

Other common uses include:

  • Commercial Property Door And Window Access
  • IT Server Rooms And Closets
  • Shipping Cargo Bay Door Monitoring
  • Vaccine Storage Monitoring
  • Restricted Area Monitoring
  • Freezer And Cooler Doors
  • Crawl Space Monitoring



Our sensors have paired exclusive RF technology with industry-leading power management to achieve the best battery life in the IoT industry. While the competition lasts anywhere from six months to two years, Monnit has made 10 years battery life possible with a pair of two AA batteries.


Our sensors provide upto 4 times the range of standard competitor wireless sensors, which means you don’t need as many Gateway’s and a much wider coverage area. Our sensor has a non-line-of-sight reach of 300 meters through upto 12 walls. This is all possible due to the most advanced Frequency-Hopping Spread Spectrum (FHSS) technology that allows for superior interference immunity from other wireless devices.


The sensor has Monnit’s most secure embedded Encrypt-RF™ Security which consists of a 256-bit Diffie Hellman key exchange and AES-128 CBC encryption for all sensor data messages. Security is maintained at all communication points from sensor → gateway then gateway → software, then back again.


The user-customization settings allow you to set the frequency of readings with the ability to set thresholds for alerts via SMS text and/or email.

The sensor will store as many as 3,100 time-stamped messages if communication is disrupted for any reason (power outage, network disruption … etc). Once the communication is restored all messages will be delivered in chronological order.