Everything you need to start taking  great underwater pictures.  The Ikelite DS51 with ball arm mount, sync cable and EV Controller sell here on ebay for well over $600 for just the strobe in some cases.  Here you get the whole strobe, ev controller and sync cable set up as well as the camera and underwater housing.  This strobe is brand new as is the camera and housing.  Don't let another great photo op get away from you.  This is all you need in one package.  See my other listing for another rig as well.

Ikelite"s EV-Controller is a manual exposure controller for Ikelite DS Substrobes exclusively. The controller provides 10 manual power settings in half-stop increments for maximum versatility and control of the flash exposure.

The EV-Controller is automatically turned on and off as the strobe is turned on and off. No battery is required in the EV-Controller as the strobe powers the controller. The power drain on the strobe is negligible.

The EV-Controller features a built-in slave sensor alllowing the controller to be triggered by the flash from another strobe or camera, or a sync cord can be connected to trigger the controller.

DS51 strobe,Diffuser,Waterproof bulkhead cap,
PRODUCT DESCRIPTION

The size and weight of the Ikelite 40441 Substrobe DS-51 Head Only make it the perfect choice for the traveling underwater photographer. The DS-51s 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 strobes battery compartment is independently sealed from the electronics preventing further damage in the event of a flood.

When combined with a compatible Ikelite TTL system or film TTL system, the DS-51 automatically adjusts brightness to provide perfect exposure whether youre shooting macro, portrait or wide angle.

Features:
• 50 Watt/seconds power with a guide #28 (underwater at ISO 100)
• Operates TTL when connected by an appropriate sync cord to some Ikelite housings or manual exposure mode with six manual power settings in one-half f-stop increments
• 70° angle of coverage, 80° with diffuser
• Recycle time of 3.5 seconds (Full power)
• Up to 200 flashes with full power batteries
• 5700° kelvin color temperature
• Depth rated up to 300
PRODUCT SPECIFICATIONS
Item Weight: 1.3 lb (0.59 kg)
Built in Slave: No
Built-In Slave: No
Dimensions: 3.2 x 3.2 x 4.7" (81 x 81 x 119 mm)
Keywords: Ikelite,Ikelite,40441,Substrobe,DS-51
Lights Included: Strobe head only
Recycle Time: 3.5 Seconds
Trigger: No
Voltage: 4x AA Batteries
Wattseconds: 50 Watt/seconds
Weight: 1.3 lb (0.59 kg)
ITEM INCLUDES
Ikelite Strobe Mount - 2x Clamps - 7" Extension - Quick Release Handle Mount - Ikelite Warranty
DESCRIPTION
The Ikelite Ball Arm Mark II Kit for DS51, DS160 and DS161 Strobes includes a complete strobe arm consisting of the strobe mount; two clamps, one 7" (17.78cm) extension and mount to Quick Release Handle. Overall extended length of the arm is approximately 15" (38.1cm). A great start to any system, providing flexibility to shoot both close-up and portrait work. Additional extensions and clamps can be added for wide angle work.

The 1" Ball Arm System Mark II 
features 1" ball components with a groove and o-ring to prevent slippage for improved holding power with less force. While underwater, clamps may be finger-tightened to keep lighting in place yet allow repositioning without loosening the clamp. All parts are hard coat type III anodized for a long lasting, scratch resistant finish. This components are compatible with most 1" arm system components from Aquatica TLC, Ultra light, Nauticam and others. It provides opportunities to mount an additional lightweight accessory almost anywhere along the length of an arm.
SPECIFICATIONS
Overall extended length Arm: 15" / 38.1cm
Extension Length 7" / 17.78cm
Ball Diameter 1" / 2.54cm
Compatibility DS51, DS160, DS161 Strobes