The SCS CTC061-3-242-WW WS Aware Monitor, 4.20MA Out, Standard Remotes works with dual wrist straps that have a standard 3.0 mm audio mono plug. It verifies proper wearing of a wrist strap by measuring an operator’s resistance. Red LEDs indicate when wrist strap fails, or when proximity sensor fails, or when wrist strap is incorrectly plugged into the visitor’s jack. Green LEDs indicate that wrist straps are properly connected and worn. The 4.20 mA data output interfaces with data acquisition systems that accept a 4.20 mA input signal.