Transmitter/Sonde, Emits Signal to be Located By Line Locator, Attaches To Push Rod or Drain Cable, Transmitter Frequency 512Hz, Frequency 1 Range, Width 1 In, Depth 1 In, Height 3 In, Power Source 1 AAA Battery Technical Specification Item Remote Transmitter Diameter 1 Length 3 Width 1 Height 3 Power Source 1 AAA Battery Transmitter Frequency 512 Hz Construction Solid Steel Core, Abrasion-Resistant Urethane Coating And Stainless Steel Wear Ring For Use With 4GB18 Pipe/Cable/Sonde Locator Application Can Be Attached To Jetters, Drain Cleaning Equipment (With Optional Couplings), Or Push Rods