Discrete Transmitter Features High Performance Wireless Connectivity. Ideal Solution for Dry Contact Switches and Monitoring Alarm Conditions. Wirelessly Monitor On/Off Status. Provides 2 Inputs for Dry Contact Relay or Open-Drain Output Devices. Seamless Integration with Third-Party Devices. Direct or Pipe-mounting Versions for Integration Flexibility License-Free 900 MHz Band, Secure Data Transmission (2.4 GHz Optional). Intrinsically Safe for Use in Hazardous Locations - Class 1 Division 1 C1D1 Wireless. Self-Contained Battery Operation.