Canon RC-6 Allows for shutter release up to 16.4 feet /5meters approx. distance .
It has wireless camera operation feature.As it uses infra-red the remote needs to be in front of the camera. The shutter release delay is 2 second. Helps to makes group photos easy.
During bulb shooting,pressing the transmit button once locks the shutter in the open state, and pressing it again closes the shutter. It is not necessary to hold down the transmit button