When you press the shutter button on Transmitter, the Receivers light doesnt change to red and do not respond to Transmitter, that means it hasnt received the signal from the Transmitter. Please follow the below steps to set the Smart Code:
1. Turn on the transmitter and receiver. 2. Use a needle-like object to press into the code setting button on receiver, which will cause the LED on receiver to flash red and green light alternately for 25s. Press the shutter button on transmitter to reset the code during the code setting mode. When the code is successfully set, the LED on receiver will get back to normal mode, flashing green light. Normally, the frequency of transmitter and receiver will be pre-set in production. You can use the timer instantly.