Vivitar Series 1 Wireless 2-in-1 Shutter Release for Sony Alpha A700, A850 A900 Digital SLR Instant Release: Press shutter release once and take immediate pictures. Multi Exposure: Press the shutter release one time and the camera will take 5 consecutive pictures, or hold down for continuous shutter release. 2 Second Release: This will give you the extra time you need to get into the perfect picture position. Long Exposure: Set camera to bulb mode and hold shutter release for 3 seconds, the shutter will now be open, then press the shutter once to release the picture