JJC JM-K Wireless Remote Shutter Release adds flexibility and versatility to your shooting style. JM-K operates with radio frequency (RF) technology, therefore a direct line of sight is not necessary; radio waves pass through objects such as windows and walls. It is unlike other wirelessremotes on the market that operate on an Infrared (IR) system and require a direct line of sight between transmitter and receiver to make things work.Since touching the camera even lightly while capturing an image can create a blurred image, the JM-K eliminates this by tripping the shutter without any disturbances. This is critical when photographing subjects close up, and for long-exposures and macros. It is also extremely valuable when photographing nature, wildlife and other subjects that are difficult for you to get close to.