4 out of 6 batteries had corrosion in the packaging. 6 replacement batteries cost $26 @ local Radio Shack. Battery installation diagram on the packaging is tough to decipher, so you've got a 50-50 shot of installing the batteries the wrong direction. If you do the "little beasties" start to generate some heat due to the short-circuit discharge. Hint: install the batteries so that the top of the batteries (side with writing) faces the wheel rim/inflation valve. Screwing the caps onto the wheel are a little tricky, you have to adjust the cap so that they flash brightly, possible they can dimly flash due to a poor fitting. There's a clear white rubber gasket (hard to see if you drop it) that seals the cap from water. The gasket kinda reminds me of the clear/white rubber washers/bands that kids use on braces. Be careful not to over tighten the cap be ause you'll pinch/loop out the gasket & thus defeat the purpose of the water barrier. Once you adjust the caps, they work as advertised. LEDs are not bright enough for daylight -- product is best for low-light conditions (i.e. dusk, dawn, night). I like the fact that the lights continue to flash 5-10 secs after motion stops, e.g. A momentary pause at an intersection. Any bump, not just rolling motion will get ' em flashing again.
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