This remote switch is designed to reduce camera shake to an absolute minimum. It is a perfect choice for taking long exposure photos. The remote has a two-stage release button, half-press to focus, fully press to trigger the shutter and take a photo. For long exposure, please press the release button fully and slide it into the locked position. The shutter will stay open as long as the shutter release button is locked. To unlock the shutter, just slide the release button back to its original position. This remote is powered by camera, you don't need to install a battery.</br> </br> Package includes:</br> </br> 1 x Remote Switch</br> 1 x 70cm long camera connection cord</br> 1 x 130cm long extension cord</br> </br> It is compatible with select Sony cameras as below:</br> </br> Alpha A58/A3000/A3500/A5000/A5100/A6000/A6100/A6300/A6400/A6500/A6600</br> Alpha A1/A9/A9 II/A7/A7 II/A7 III/A7R/A7R II/A7R III/A7R IV/A7S/A7S II/A7S III/NEX-3NL</br> DSC-HX300/HX400/HX400V/HX50V/HX60V/HX90/HX90V</br> DSC-RX10/RX10 II/RX10 III/RX10 IV/RX100 II/RX100 III/RX100 IV/RX100 V/RX100 VI/RX100 VII/RX1R II/WX500/ZV-1