The e50 offers a new body and improved internal components while still offering Zircon's proven technology. Patented new shape makes it easier to hold in either hand at any angle. The sensor can detect the edge of wood, metal studs or joists up to 38mm deep and is indicated by the arrow shaped spot light pointer and an audio tone. The sensor also includes a WireWarning detection system to indicate the presence of live electrical wiring. Batteries not included, 1 x 9v battery required.