Install the CR-2 battery to receiver and the AAA batteries to transmitter Slide the receiver into your camera's hot shoe, and then rotate the hot shoe lock nut clockwise to secure Connect receiver to camera's remote socket with the included cable Turn on the transmitter, receiver and camera Set the transmitter and receiver to the same channel Press the "Hold" button on the transmitter, when the light of the transmitter and receiver is lit simultaneously, it means the pairing is successful Set the time and numbers you need from "DE" to "N" on the remote For bulb exposure photography, need to set your camera's shutter speed to bulb mode first Press "START" button for shooting How to use as a wired timer remote? Install the AAA batteries to transmitter Connect transmitter to camera's remote socket with the included cable Turn on the camera and transmitter Set the time and numbers you need from "DE" to "N" on the remote For bulb exposure photography, need to set your camera's shutter speed to bulb mode first Press "START" button for shooting