SIMPLE OPERATIONSimply insert the tester into an already powered three-pin socket. The socket wiringcondition and Ac voltage can be easily determined based on the information displayedon the instrument screen Insert the tester into a standardthree-pin power socket . If a wiringsequence error is detected , theorange backlight illuminate toindicate a wiring error After inserting into the socket, the dataautomatically locks after three seconds.Once locked, the unlock buttonto release the data If there is no operation within 5 minutesof powering on , the instrument willautomatically shut down Battery: AAA * 2 (shipped without) Due to different batches, there may be differences in product appearance and printed text, which not affect use Plug Type :EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage: AC 220V Colour:Black Material:ABS Package Contents: 1 x Socket tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.