PRO+ Bulk Cellular LTE - Cat - M1 for Over 4&'; TallThe PRO+ Sensor combines all the best technology of our ultrasonic sensing for the best sensor performance ever, using long-range Bluetooth communications to monitor tanks from the Mopeka App. Approximately 3x the range of a normal Bluetooth sensor, this sensor is ideal for tanks located a long distance from the house. It can also be used in conjunction with a MopekaIoT Wifi Bridge to monitor tanks when outside of Bluetooth range.*Should your tank have a horizontal seam along the bottom length of your tank, please see the Mopeka Seam Adapter for Pro PlusFeatures: Mopeka PRO+ Bulk Cellular Sensor For Storage Tanks Cellular Communications LP Gas Tank Monitor For Bulk Storage Tanks Battery Powered Magnetically Attaches To Tank