Opteka Wireless Radio Remote Release for Canon EOS Digital Rebel XT, XTi, XS, XSi, T1i, T2i, 60D, G10 & G11 Digital SLR Cameras (650' Range) With the receiver connected to your camera's remote control socket, you can press the button on the remote control to trigger your camera's shutter wirelessly! Range up to 200m(650ft) without obstacles Can activate auto focus, release shutter, activate continuous drive mode or keep the shutter open for bulb photography as well The shutter button can be pressed halfway or all the way. Number of control output channels: 16 channels available