As wireless RTU (remote telemetry unit) with datalogging and alarming capabilities suited for weather and water monitoring applications, ADU-500 supports periodic data transmission via SDI-12 sensor connection according to user-defined parameters. Data can be sent via SMS to users or via FTP to internet server, and D-size Lithium Thionyl battery supports up to 10 years of operation. Features include 3 digital inputs, 2 analog inputs, one pulse counter input, and multiple excitation options.