Feature: 1. Built In Induction Coil: The receiver has a built in induction coil to receive magnetic signals from the pipe, and the coil generates an induced current to calculate the direction and position of the transmitter. 2. Efficient: Using the 512Hz transmitter, the position of the probe can be easily determined. Save time and money. 3. Led Display: With an led display, you can view the monitoring data more clearly, conveniently and practically. With high power speaker, earphone answering function, removable antenna. 4. Waterproof And Durable: Made of ABS, aluminum, steel material, waterproof and durable. The transmitter and receiver are integrated detectors, transmitter is non rusting steel lagging process, waterproof and smashproof. 5. Widely Used: Used for water supply pipelines, cable pipelines, pipeline vacuum systems, industrial pipelines, underground pipeline construction, underground cave exploration, underwater research and other exploration work. Specification: Item Type: Pipe inspection receiver Material: ABS, aluminum, steel Weight: Approx. 2355g / 83.1oz Detector camera locator: Operating frequency: 512Hz Modulation: None Battery: 6 AA alkaline batteries (shipped without batteries) Usage Time: 4 hours intermittent use Audio Output: 50-1000Hz determined by signal strength Operating temperature: -20°C to 60°C Product Length After Assembly: 53cm / 20.9in Sensor: Separate angle sensor to obtain peak and zero signal Transmitter: Diameter: 23.5mm / 0.9in Length: 73mm / 2.9in Probe Frequency: 512Hz Battery: 1xAAA (shipped without battery) Interface: 1/4-20 Process: Gluing process, waterproof and antismash. Package List: 1 x Host 1 x Transmitter 1 x Transmitter Connector 1 x Antenna 1 x Earphone 2 x Manual 1 x Aluminum Box