This unit is blending four different OCEAN REEF units into one: the extended range of the Gpower, the like-stereo sound of the GSM SL, the clearness and double channel option of the DC and the battery life of the Gdivers. Features: Its foldable inside the mask. Now you dont need to assemble the comm unit and take it off the mask. Simply fold it close and pack the IDM. Brand new rechargeable, changeable battery with an autonomy of approximately 30 hours. No need to purchase disposable batteries to throw away once they are done. No need to purchase batteries before a dive trip. Recharge with a standard micro USB cable from any power source you want. Digital as the first ever unit we introduced in the marketthe DC. This one adds clearer communication, with a higher volume AND 2 earphones for a stereo-like experience. Double channel unit for separate teams/conversations, depending on the surrounding environment conditions, it exceeds a range of 800ft /250 meters. DAT (Digital Activati