The Aquacom MK2-DCI is a compact, self-contained two- or one-diver air intercom. It will provide one or two divers, using a Full-Face Mask and Ear/Microphone Assembly, with clear communications either in the 2- or 4-wire mode. However, up to 6 divers can be stacked and all be on line together (4-wire mode). The 20 watts of power ensures clean, crisp communications over long lengths of communications rope. State-of-the-art circuitry allows intelligibility that is second to none. Our unique battery protection microprocessor will protect your batteries from being damaged due to extreme low voltage conditions. NON-RECHARGEABLE (Batteries Not included) RECHARGEABLE OPTION (Order Separately) RB-6v Rechargeable Batteries (2 required) RCS-13US Smart Battery Charger Battery Life - 20 hours continuous useFrequency Response - 600-12,000 HzOutput Power (watts) - 20Charging Time - 14 hours with optional gel-cell batteriesControls - Volume: Tender, Diver 1 & 2, Speaker, Cross Talk, PTT, Speaker On/Off, Select diver 1,2 or bothSpeakers - Heavy duty front panel or optional headset with boom microphoneLow Battery Indicator - LED type battery meterBattery Type - (2) 6 volt lantern batteries (heavy duty) or Optional (2) RB-6V rechargeable batteriesDimensions (WxHxD) - 14″ x 10.60″ x 6.85″Weight - 14 lbs Aquacom® MK2-DCI User Guide