This is the Nautilus Lifeline Marine Rescue GPS for Scuba Divers

Features:

• AIS/DSC Technology
• No MMSI, Licences & Registration
• 5 Year Battery Life* (User-replaceable batteries / * Batteries not included)
• Diver Depth Rated To 425 feet (130 meters) with cap closed
• Transmits GPS Position To Boats Up To 34 miles
• It Floats! Positively Buoyant
• Temperature rating -25°C - 55°C
• Dimensions: 2.9 x 3.8 x 1.5 inch (75 x 97 x 39 mm)
• Weight: 4.6 Oz (131g) including batteries
• AIS Transmit Power: 1 Watt
• AIS Frequency: 161.975 and 162.025 MHz
• DSC Transmit Power: 0.5 Watt
• DSC Frequency: 156.525 MHz

The all new Nautilus LifeLine Marine Rescue GPS is less than half the size of the original radio and it is incredibly simple to use. Simply undo the latch and open, turn on, remove the red distress cap and press the red button. That's it! Your GPS position accurate to 1.5 meters and a man overboard distress message will be broadcast to all AIS equipped ships up to 34 miles away as well as a special DSC message to the marine radio on your own vessel. Your Nautilus LifeLine floats and is waterproof in all sea conditions. Just keep the o-ring clean and forget about it for the next 5 years. Don't get left behind!* Batteries not included