"DXL4 Datalogging Dual Frequency Digital Receiver with Built-in Datalogging for Locating & Avoidance of Energized Power cables & Metallic Utilities, based on 4 operating modes including Power, Radio, Allscan & Generator mode. Converts to a pipe and cable route tracer & provides depth measurement when used with an SGA4 Signal generator. https://agg-blackbox.com/Instrumentation/-Stanley-DXL4-Digital-Cable-Locator-