These Visorak themed BIONICLE watches make for a nice small collectible to have on a shelf, and aren’t so expensive you’d be afraid of opening it! It’s hard to say if it fits an adult, as the wrist strap appears to be mostly fabric and velcro instead of the interchangeable plastic links of other LEGO watches. If it does fit, you may have to spend more on installing a new battery than on the watch itself. By now they are well past their expiration, but that may be a small price to pay if you want it to tell you the time while showing others that your a member of the BIONICLE fandom.

You can get one here on ebay for $28.50 shipped from a seller going by yo-yo_flamingo. However;

A Bricklink seller going by Yo Yo Flamingo (Who is probably the same as the eBay seller) has them listed for a mere $18.00 USD at his shop “Set You Up“. The Bricklink store didn’t show me shipping costs, but his eBay shop listed shipping as $3.50. Unless the Bicklink shop tacks on some kind of fee, your likely to save an additional 7 bucks there.