The REDARC hall effect current sensor is an electronic device which is designed to measure the current flowing in a circuit and output the value of that current as a voltage signal. (i.e. can monitor the amount of current to or from your main or auxiliary battery).The REDARC Hall effect current sensor is a high performance. compact cable mounted current sensor suitable for installation into rugged environments where a fully sealed product is required to assure reliability. This REDARC device is 100A rated and cannot be damaged by overload.The GS-AMPS is an optional sensor that is compatible with the following REDARC gauges: G52-VVA. G52-VA. G52-BEA and G52-TA. Warranty :2 YearsSupplied Cable :4mInput (Operating) Voltage :8VDCLength (mm) :54Width (mm) :31Height (mm) :10Weight (kg) :0.1