Wireless RF (radio frequency) remote control for your Sony Alpha DSLR-A100, Minolta Maxxum/Dynax/AF 7D, 5D,9, 7, 5, 4, 3,Minolta Dynax/AF 9000, 7000, 5000, Minolta Maxxum/Dynax/AF 807si, 800si, 700si, 600si, 505si, 500si, Sweet, Sweets, Minolta DiMAGE 7Hi, 7i, 7, 5, A1, A2, A200. Maximum operating range 100m. Compared to an infrared (IR) remote control, it allows you to operate the shutter from either direction/angle. It supports unique coding for anti-interference and avoiding wrong operation. 3 operations modes: At W Mode; the receiver is active, you can use the transmitter to control the shutter or focus. At O mode; the receiver will be a normal remote switch, and it will not consume any power. At L mode, the receiver will lock the shutter for long exposure (Bulb Mode).