Line Transmitter CAT Safety Rating Not Rated Circuit Connection Type Direct Induction Features Accepts RIDGID 18V Batteries Direct Connect Using Attached Clips Induction from Optional Inductive Signal Clamp and Transmitter Coils For Locating Energized Lines Includes (2) 10 ft Coil Connectors (2) 18V Battery Battery Charger Shoulder Strap Locator Type Utility Line Signal Transmitter Maximum Locating Depth Not Applicable Operating Frequency 1 kHz 33 kHz 8 kHz