Product Troubleshooting: Ensure that your collar is turned on. The collar should be flashing red. If the collar is not flashing red, you can gently shake the device to automatically bring it out of sleep mode, or press the reset button with the included pin. The collar is fitted with a motion sensor that turns on the device when movement is detected - you can hear the motion sensor rattling inside the collar. 1) Press the reset hole on the collar receiver with the included pin, or something small like a paper clip. A beep will sound, and the indicating light will turn on. 2) Immediately press the y button on the front of the remote transmitter (the right hand button) once and the receiver collar will beep indicating the 2 devices have been paired, and the indicating light will turn off. Note you need to press the y button to pair the device within 10 seconds of the 1st beep for pairing to be completed. If the device does not pair successfully, press the rest button with the included pin and try again. Test your device to make sure it works on each mode. When testing vibrate or shock modes, ensure that the level setting is set to at least level 1. Note the default is 0 and needs to be moved to 1 otherwise you will not feel any vibration or shock. Pairing an additional collar also, if you pair the remote & receiver on channel 1, it will only work when the remote is set to channel 1. To pair channel 2, change you remote to channel 2 and repeat the steps above to pair a second collar.