Thanks for the purchase!
This is the very first batch of the product and you may have to pair the button with the siren first as pointed out by JDRoberts.
But also, when testing the product, remember to put it down on a table, do NOT hold the button in your hand as it will interfere with the signal and make it look like the range is terrible (we’ve been there…).
You should have no problem after that. Drop us a line if the product is still giving you trouble.