The Ocean Reef GSM G-Diver Communication Unit is a wireless underwater communication device that has a range of up to 250 meters in calm waters. It’s lightweight design and push-to-talk functionality make it great for teaching and guided tours. The unit takes a single 9V battery, but it will warn you when the battery is running low with an audible beep every 30 seconds.

• Push-to-talk functionality is easy to use
• Range of up to 250 meters in calm waters
• Lightweight design to reduce neck fatigue on long dives
• Comes with Neptune Adjustable Communication Support Clip
• Operates on the same frequency as other Ocean Reef products
• Uses one 9V battery with audible warning beep