The MK-III offers unprecedented performance at an affordable price! Designed for Commercial, Military and Professional divers, the MK-III has the ability to communicate with 3 divers simultaneously in loud, hard working conditions due to it’s powerful speaker. The panel displays a 3 diver color coded section to allow a surface tender to quickly identify and adjust volumes on the fly. The connector panels have the ability to be switched as needed, quickly and easily. Features • Connector Panel - Banana Plug Umbilical Panel (2/4 wire capable)• Aux. Input for Music and Pre-Recorded Messages - A panel mounted AUX input makes playing music or pre-recorded messages easy with a simple RCA connector.• Connect Two Boxes Together - The ability to connect two boxes together gives even greater versatility to the MK-III 3 Diver Box by allowing up to 6 divers to talk simultaneously with a surface tender.• Powerful Speaker - The MK-III 3 Diver Box delivers incredible sound delivered by a powerful panel speaker, perfect for noisy environments where extreme volume is needed.• Accessory Compartment Lid - The easy to remove lid of the MK-III doubles as an accessory storage compartment for headsets, extra batteries and other accessories. Specs Input Power - 12VDC (Minimum 3 amps) or 90–240 V AC, 50–60 HzBattery Type/Life - Nonspillable Lead Acid, 12v, 7.2Ah / 20 hours idle, 12 hours WorkingFrequency Response - 300-4,000 HzOperating Temperature - -40°C to 50°C (-40°F to 122°F)Storage Temperature - -40°C to 40°C (-40°F to 104°F)Cabinet - Molded ABSFront Panel - Stainless SteelSize - 10-3/4in x 16-3/4in x 8-3/4inWeight - 19.5 lbs (8.84kg)