Now you can continue reading right where you left off! In my old age I usually need to back up a bit to get reoriented to whatever I'm reading. I don't think I'll run out to buy a book marker with a finger pointing at a specific word
Also great for kids of age to carry a house key - Bracelet key, no more putting keys in your pocket. Great for jogging and wearing pocketless pants. Dude I'm 14 and I still lose house keys I need this badly.