Fly the Team Iceshanty Flag! Iceshanty Proshop
A cheap audio alarm will work just as good, they are used on windows and are sold in dollar stores.
Have any of you ever had any luck with the clip-on lights for tip-up flags? I've heard mixed reviews, and I'd like to know if any of you have brand recommendations.
For all that are reading looking for the best lights to use for night tip up fishing. Try these lights. Only $8 and last a long time. https://www.ebay.com/itm/TIP-UP-LIGHT-Highly-Visible-LED-TIP-UP-LIGHT-in-Red-White-Blue-or-Green/202157187555?var=502143887844&hash=item2f1181e1e3:g:tWYAAOSwdjdaPGTN
By far the best tip up lights I have ever seen. They will tell you what's going on with the bait even if you are half way across the lake!http://www.tipuplights.com/