The DS161 Underwater Substrobe with Battery Pack and Smart Charger from Ikelite is a strobe flash equipped with a built-in 500-lumen video light. The strobe has a power rating of 160 watt-sec, and provides a 90 degree angle of coverage, which is increased to 100 degree when using the included diffuser. The DS161 has a color temperature of 4800K. Its depth rating is 300' (91.4 m). When combined with a compatible Ikelite TTL system or film TTL system, the DS161 automatically adjusts brightness to provide ideal TTL flash exposure--whether you're shooting at macro, portrait, or wide-angle focal lengths. Included with the strobe are the #4067 Battery Pack and #4066.1 Smart Charger.