Electrical plug is on a 10 in (254 mm) flexible electrical cord to access electrical outlets in difficult to reach locations|Powers off automatically after approximately 2 min of non-use to conserve battery life|Built to withstand a 6.6 ft (2 m) drop|Measurement category III is applicable to test and measuring circuits connected to the distribution part of the building's low-voltage MAINS installation|The RT310 features a patent pending AFCI test method that is unique to Klein Tools|Test GFCI devices by simulating ground fault conditions|Capable of detecting a dual-open wiring fault with simultaneous open neutral and open ground wires (patent pending technology)|Designed to test North American-style grounded electrical outlets in 120V AC circuits (incorporates a three-pin plug)