This is a drain pipe camera that comes with a waterproof design. Using 512Hz of frequency, this camera is sensitive in detecting the location. This high quality drain pipe camera is durable and long-lasting.

• Waterproof design.
• For detecting locations.
• Support custom-made, accessories are interchangeable.
• FM locator: transmitter and receiver.
• Transmitter: sends 512Hz frequency.
• Receiver: receive the frequency and locate the bad pipe.
• Size: Φ22.5*L48mm, 512 x 110 x 118.
• Power source: #357 button cell nonchargeable.
• Power source: 6 AA alkaline.
• Battery life: 3-4 hours and 30-40 hours.
• Frequency: 512Hz.
• Tone type: beeping or continuous.
• Weight: 810g.
• Thread: metric 15mm or pitch 1 mm.
• Operating temperature: -20 to 50℃.
• Range (cast-iron): up to 10ft. 
• Controls: on-off, sensitivity, near and far toggle switch.
• Range (nonmetallic): up to 15ft.
• Minimum line size: 1in.
• Output: signal strength meter, speaker, earphone and battery indicator.
• For more information: http://wopson.com/china-Drain_pipe_detective_location_waterproof_512hz_transmitter_sonde-id47.html.