Supremely functional for maximum creative control-access is provided for all important camera functions. The NEW Dry Lock (DL) Port System gives added security at the surface of the water and accommodates large diameter lenses. Extra-large, soft touch zoom knob; Zoom is accessible for many lenses using our unique universal zoom gear system. Vacuum valve included; Test your system after assembly prior to entering the water; Pump sold separately. Included Ikelite ICS-5 bulkhead connector with manual hotshoe for reliable electrical triggering of underwater strobes; Optional TTL circuitry provides automatic exposure with compatible Ikelite DS strobes. Control symbols are laser etched into the back and will never fade or rub off. Quick install camera mount plate does not need to be removed for battery or memory card access. One spare 1/2-20 threaded accessory port locations on the front of the housing for the addition of optional accessories. Includes a balanced aluminum base with left-hand quick release handle; Right-hand handle sold separately. Signature open-groove design suspends the rear o-ring in a natural position that is easier to maintain and more reliable than forcing the o-ring into a channel.