OCEAN REEF has launched a new ultrasonic digital communication unit. 'GSM Mercury' has a 40 mt / 131 ft depth rating, a range of 250 mt / 820 ft and it is compatible with all previous OCEAN REEF and competitor units on the same frequency.
It comes with a rechargeable battery via a standard micro USB, with a 30 hour operating time.
Apparently the unit has a dynamic microphone that removes unnecessary noise such as bubbles being exhaled from the mask. Other features include hands-free operation, two earphones for a stereo like experience, and two channels for separate team / conversations.