Elpro 105U-4 Radio Telemetry Modem. Provides a Radio and Serial port with 4 fixed Digital inputs and 4 fixed output, 12 configurable Digital inputs/outputs, 4 Pulse inputs and 4 outputs. Power Supply 11-30vDC or 15-24vAC. Standard 458Mhz frequency at 500mW, line of sight range up to 10Km, suitable for UK use. Extruded Aluminium DIN Rail mountable housing, dimensions 130 x 185 x 60mm ...