The size and weight of the DS51 make it the perfect choice for the traveling underwater photographer.

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Compact and easy to use: The DS51's intensity and angle of coverage are comparable to any strobe in its class. The strobe can easily switch between TTL/Auto and any of the six manual power settings through a large, easy-to-turn dial on the rear of the strobe. A simple battery door is easy to remove and replace and provides a clear view of the o-ring seal. The strobe's battery compartment is independently sealed from the electronics preventing further damage in the event of a flood.

TTL Flash Exposure: When combined with a compatible Ikelite TTL system or film TTL system, the DS51 automatically adjusts brightness to provide perfect exposure whether you're shooting macro, portrait or wide angle.

Recommended accessories: For example the convenient arm and sync cord combination kits for attachment of the DS51 to Ikelite TTL systems.

Functionality: The DS51's intensity and angle of coverage make it equally suited for macro and general photography. The strobe's wide-angle diffuser increases the angle-of-coverage up to 80 degrees, softens the light and helps to reduce backscatter. The strobe can easily switch between TTL/Auto and any of the six (6) manual power settings for complete control over lighting the subject. The DS51 Substrobe's power rivals strobes twice its size, recycles in a quick 3.5 seconds, and provides 200+ flashes on a set of batteries. Much shorter recycle times and more flashes per set of batteries can be realized during TTL operation or when using manual fractional powers.

More information:
Ikelite's own site [here]

Specifications

Flash Recycle Time: 3.5 seconds (shorter in fractional power settings)
Flash Guide: 56 ft (17 m) at ISO 100
Flash Angle of Coverage: 70° (80° with diffuser)
Flash Color Temperature: 5700K
Flash Modes: TTL, Full, 5 fractional powers in 1/2-stop increments
Modeling Light: No
Diameter: 3.2 in (81 mm)
Length: 4.7 in (119 mm)
Weight: 20.8 oz (590 g)
Buoyancy: Approximately neutral
Depth Rating: 300 ft (90 m)
Bulkhead: Ikelite ICS-5
Fiber Optic Option: With 4401 Adapter
Slave Option: With 4100.6 EV Manual Controller
Batteries: 4 AA cells (Alkaline, NiMH, NiCad or Li-Ion)
Battery Door: 9440.45

In the Box
DS51 strobe
1" Ball Mount # 4081.4
Diffuser # 0561.2
Waterproof Bulkhead Cap # 9104.5
Silicone Lubricant 1cc tube