【Compatible with】 Nikon D800, D700, D300, D2X, D2H, D200, D1H, D1X, D3X, D3 etc. 【Wireless Remote Shutter Release (On camera)】 You can mount one RF603 II receiver into the camera and connect it with the camera via the 2.5mm shutter connecting cable, and can remote control the camera with other receiver. 【Wireless Remote Shutter Release (On camera)】 You can mount one RF603 II receiver into the camera and connect it with the camera via the 2.5mm shutter connecting cable, and can remote control the camera with other receiver. 【To fire the Flash Speedlite】 One RF603II receiver can fire one flash speedlite, one set of RF-603II can control 2pcs Flash Speedlite at the same time. 【Additional Function】 Adding the Locking rings. Improved Flash / Shutter control Buttons. Working for more non Canon/Nikon cameras and single firing pin cameras. Auto-Focus, Continuous shooting, Long Exposure, Half-Way Pressing, Full-way Pressing and Bulb.