The transmitter may be connected to other electrical fixtures using optional accessories which are sold separately (Cat. No. 69411)|Receiver powers off automatically after approximately three minutes of non-use to conserve battery life|Built to withstand a 6.6 ft (2 m) drop|Measurement category II is applicable to test and measuring circuits connected directly to utilization points (socket outlets and similar points) of the low-voltage MAINS installation|Transmitter incorporates a GFCI outlet tester to inspect the wiring condition at the electrical outlet and test GFCI devices