The FloTech FT208 CheckMate Retain / Overfill Monitor has the following features: - Operates on 12 VDC or 24 VDC systems. Monitors up to eight overfill sensors. Monitors up to eight retain sensors. Top Only or Top and Bottom configuration. Connects to Float, Thermistor or Optic style rack. Non I.S. Relay Output 1. 12 VDC, 1 AMP. MAX. 2. Permissive: Closed 3. Non-Permissive: Open The monitor is field programmable. Simple Wiring – no jumpers, terminators or dummies. Compatible with Two Wire or Five Wire type sensors.