Additional transmitters are available for expansion or to differentiate between multiple signals compactness,durability and portability The transmitter is integrated with the function of voltmeter,which can measure 30 to 400V voltage on a linear basis. The screen of the transmitter can display preset transmitting power,transmitted codes,its own battery ,mains voltage detected, status of mains voltage detected, and warning symbol for mains voltage. Detecting cables,electrical lines,water/gas supply pipelines buried in wall or earth. Detecting interruptions and short circuit in cables and electrical lines buried in wall or earth. Detecting fuses and assigning current circuits. Detecting interruptions and short-circults in floor heating. Detecting sockets and distribution sockets having accidentally been covered by plastering. The Transmitter has the function of self-inspection to detect its own working status and to display it on the LCD screen for user's reference. The sensitivity of the receiver can be adjusted either manually or automatically. The receiver can sweep frequency automatically,both the transmitter and the receiver can work under mute mode When installing or replacing the battery, please be sure to pay attention to the correct polarity of the battery. If the battery polarity is reversed, damage to the device may occur., Weight: 3.0423792156 Pounds, Manufacturer: Taviko