The Ridgid 66508 Utility Locating Kit includes the SR-20 Utility Line Locator, ST-305R Transmitter, 4 in. Inductive Signal Clamp. Users are provided with the SR-20, which is a lightweight and rugged receiver that provides all needed information for fast and accurate locates. With the SR-20, users are able to trace all frequencies from 10Hz to 35 kHz. The 66508 kit also includes the ST-305R, which is a powerful multi-frequency transmitter tool for finding buried conductors such as pipes, cables, and wires. A battery shoe can be powered by a Li-ion 18V rechargeable battery or six alkaline NiMH C-cell batteries.