OTS MKII Buddy Phone® - AGA Full-Face Mask: Buddy Phone® enables communication between divers up to 500m. Surface-to-divers units also available1:29 PM Push-to-talk button activation conserves battery life Full-face mask keeps your face dry and warm and eliminates jaw fatigue and dry mouth Silicone skirt for comfort and durability Air circulates across lens keeping it defogged Demand valve regulator conserves air Surface to Diver comm. unit available