The Excalibur II is good for divers down to 200ft deep. It's a VLF machine with built in headphones and coil.

Specs:

• VLF BBS technology
• Waterproof to 200ft.
• 17 frequencies 1.5khz to 25.5 khz
• RCB circuit for target amplification
• Tone ID
• NIMH rechargeable battery
• Pinpoint Mode
• Auto ground balance
• High visibility case and coil cover
• 5.1 lbs.