Wall-mounted single-channel receiver with a large 3.0-inch, 3-digit display and a 24 V / 600 mAh backup battery. Includes three-stage alarms, trouble indication, relay contact outputs, self-diagnostics and warning-light compatibility. Accepts 4–20 mA detector inputs and provides 4–20 mA output, with optional isolated RS-485 Modbus communication. Dimensions: 280 × 389 × 153 mm; weight: 2.7 kg.