The MK-7 BuddyLine is a compact, self-contained one or two-diver air intercom. It will allow clear communications in the 4-wire mode (round robin) and includes the THB-7A Deluxe Headset (with boom mic). The MK-7 BuddyLine was specifically designed for Search & Rescue Teams to have an underwater communication device that needs little set-up time. The 2 watts of power is managed by state-of-the-art circuitry allowing relatively long life and great intelligibility. MK-7 BuddyLine operates on 8 AA alkaline batteries. The MK-7 BuddyLine and our ComRope is a great package that ensures a dive operation runs smoothly. Specs Battery Life - 12 hours continuous useFrequency Response - 600 to 10,000 HzOutput Power (watts) - 2Charging Time - 14 hours with optional rechargeable batteriesControls - Volume: Tender, Diver 1, Diver 2Speakers - Headset with boom microphoneLow Battery Indicator - Audio ToneBattery Type - (8) AA alkaline BatteriesDimensions (WxHxD) - 4.35″ x 6.725″ x 3.0″Weight - 1.5 lbs with batteries Aquacom® MK-7 Buddy-Line User Guide