The seculine twin 1 r3 utn2 remote is an infra red shutter release trigger for use with the nikon d90 and d5000 cameras in conjunction with the cameras built in ir infra red receiver facility the ir facility will work over distances of up to 50m and there is also a cable supplied for direct connection to your d90d5000 camera for bulb release the twin 1 r3 trigger also has a convenient lock for long or timed exposures so that you do not need to keep your finger on the button