AEI-920TP Wriststrap/Ground Tester       Size (h.w.d): 1"x 2.4" x 2.3" Touch Pad Safe Condition = Less than 10 Meg Ohm Power 3.2V Lithium battery Visual Alarm Color LED Indicator:   Green = Safe Operation Automatic, Unit is activated when operator touches the pad. Installation AEI-920TP Installation and Test (PDF)