Model RM-SR-KIT includes: (2) ZP24D-25-RM-SR radio modems, (2) 24VDC 30W power supplies, (2) 1.8m/6ft serial cables. Cable-free. License-free. 2.4 GHz short-range radio modem kit connects serial devices over a wireless network. Plug-and-play set-up saves installation and maintenance costs. 10 to 48 VDC or 18 to 30 VAC wide range power input. Power supplies included. TWO NETWORK CONFIGURATION OPTIONS: 1. Serial-to-Serial Connectivity: Two or more serial (RS-232/422/485) devices connected over a wireless network via Zlinx Radio Modems. 2. Modbus I/O: Analog, digital and temperature I/Os (up to 247 base I/O modules, one frequency type) can be connected wirelessly to a Modbus RTU Master (PLC, SCADA, HMI). INDUSTRIAL-GRADE - Wide operating temperature and dual power supply. Heavy-duty, IP30 DIN mount industrial grade case, components and circuitry. RANGE - Model RM-SR-KIT supports an indoor maximum range of 91 (3000 ft) and outdoor maximum range of 1.6 km (1 mi). Includes RPSMA male dipole antenna.