WM-5000E guard tour reader is a very popular guard patrol product in the market. Small-sized, rugged, and low power consumption are its advantages. With unique design and special adhesive, WM-5000E iButton reader is waterproof. No any screw on the surface makes it super durable. One 3V lithium battery can read 350000 buttons continuously. If you need a dependable, tamper-proof guard patrol system, WM-5000E guard tour system is the obvious choice.