The socket circuit analyzer is a 2 in 1 pocket pen type intelligent multimeter and power polarity detector, with stable performance, high reliability, clear reading, and overload protection function. They can timely remind users to make adjustments to faulty and safety hazards of the sockets,repair your protection system, and ensure home electrical safety. Specifications: Plug: EU / US (Optional) Material: ABS, Metal Model: A3012 Alarm Method: Sound light alarm Rated Current: 1∆n=5mA Socket Rated Voltage: Un=200V-250AC AC Voltage: 12-300V, 50Hz-60Hz Precision: (4%+10) Power Supply: 1 * 1.5V AAA battery (Not included) Item Size: 197 * 35 * 30mm / 7.75 * 1.37 * 1.18in Item Weight: 67g / 2.36oz Package Weight: 142g / 5.01oz Package Size: 21 * 5.8 * 3.2cm / 8.26 * 2.28 * 1.26in Package List: 1 * Socket Circuit Analyzer 1 * Socket Protective Case 1 * User Manual (English)