HeBei LEES Industrial Co.,Ltd ShangHai Branch(Abbr.HBLSSHB) ,is a trader and manufacturer in China mainland. Our products: non-contact voltage detector; wireless Doorbell chimes; The Wireless paging& doorbell system; Business types: Exporter,OEM/ODM , Manufacturer , HBLSSHB NCV-S: Tests from 110 to 600 volts AC Check for AC voltages without necessity of disconnecting the electrical system Use to detect the presence of voltage at outlets, voltage cables,circuit breakers, wall sockets, lighting fixtures, junction boxes, fuses,etc. Comfort grip to ease fatigue. Convenient pen size fits into pocket or tool pouch. The alarm offer sounds,that indicate signal persence of voltage Compact design fits in shirt pocket Accessories Included: (2) 1.5V AAA batteries.. Replace batteries quickly by pressing the release lever and twisting the top of the detector.