Aqua Signal 12v Series 25 Combination Masthead/Foredeck Light, Black Housing, 7"W x 5.5"H x 2.4"D. 2-hole mounting on flexible flange which wraps around mast. Masthead bulb: 12 volt/10 watts; Foredeck bulb: 12 volt/20 watt halogen. Replacement bulbs: 10 watt festoon bulb - Concave (Prior to June 2010) AQS-90200-7; Convex (After June 2010) AQS-90203-7. 20 watt Bayonet bulb: AQS-90470-7. Wire not included. 2 nautical mile visability for vessels to 39 feet.