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I have a set of four. Don't leave home without them. I added a small piece of aluminum to my polar and HT tip-ups for the sensor to be rubber banded to. They work awesome, and up to 600 feet away.At night I am able to sit in the house and play Pinochol, when the pager goes off, you look out and see which tip-up is lit. It also allows for me to focus my attention on my jigging rod, instead of constantly scanning for flags. Theres nothing worse than having other anglers hollering "hey dude in the shanty, you gaot another flag!". That will never happen again!. Get em if you can!