"1) Please pull out the plastic at the remote control side 2) Set your camera to remote mode. 3) Use this remote to picture yourself, picture your family union. No body is missed. 4) Infrared can not be seen by human eyes, so the light from the LED is invisible. 5) The infrared receiver on the camera is at the front side, so this remote control should be used at the front side of the camera, you can stand away from the camera maximum 10 meters. 6) It has 2 seconds delay function, so you have time to hide the remote before the camera shoot. 7) Battery: CR2032 8) Compatible with: Canon 7D / 5D Mark ? / IDX 9) Two kinds of control mode: Wireless distance is 5-10m, limited models rolled off the long 50cm"