EXR-AE237 Electric Cock Ring Pairing instructions: To pair the device with the remote you need to quickly press either the shock or vibrate button on the remote while the red light is blinking on the cock ring.
I should have paid more attention to previous buyers... this thing is junk and did not work at all. Everything about it was just cheap and garbage. I ended up buying an actual dog shock collar that was way less expensive, actually worked, and had way more functionality.