Here's what other brands won't tell you: left out in open air, any scented bracelet fades within a few days. Which is why people write reviews saying it worked for the first half of the holiday and then stopped, they wore one continuously until it died, then blamed the bracelet.
Ours don't get left out. All 12 sit in one resealable pack, and the clock only runs while a bracelet is out of it.
Wear a pair today, seal them back tonight, take a fresh pair tomorrow, the used pair recovers.
Up to 10 days of wear per bracelet, spread across as many trips as you like. Unopened, the pack stays good for up to two years.