1.Double Color Backlight,Orange Backlight Indicates High Voltage.Orange Backlight With Voltage Greater Than 80v Or Currentgreater Than 1a Automatically Lights Up. 2.Ncv Non-Contact Voltage Detection.The Stronger The Induction Signal Is, The More Urgent The Buzzer Is. The Indi-Cator Light Is Red. 3.Easy Battery Life,Two 5th 1.5v Batteries Can Be Replaced Quickly 4.Misoperation After Five Minutes,Automatic Shutdownyou Can Wake Up By Pressing Func