One didn't work right out of the box and a couple others died in less than a month.These are awesome except for I was extremely excited for the rubber duckie in it as that is my sons FAVORITE toy. That was the *only* one in the pack that didn’t work. Otherwise, this set is absolutely awesome!!!! Love the variety!These are probably the cutest little bath boys I’ve ever seen. I wish the battery life was longer but I still use them for my daughter in the bathtub. With no battery life they just went from really really really cool to I’m just really cool. If that makes sense lolThese were a huge hit. After 3 times using them, only 2 are still working. They're super cute though... Not sure if the batteries are replaceable or not...My son loves that!I ordered this product as a just because gift for my young niece and nephew. 2 of 10 toys worked great. The other two didn't light up. Not a huge issue as they will play with them anyways. When contacting the company to request 2 replacement toys, they wanted all returned. We decided to just keep them instead. Not worth the hassle to return them. A bit pricey for what you get but I was surprised how bright they are. You can see them glow with the bathroom lights on just fine, too. The kids like them so it was a win for Auntie! ? lol. And easy dry off with no mold or standing water so a win for their mom too.Really like the fact that you get so many makes you feel like money well spent. however first used day after Christmas and all but one no longer lights up. My 2 year still enjoys playing with them as is but mother disappointed lights no longer work.Like other reviews say, some didn’t light up when they arrived but still. Chewable and eye catching for little one to grab at under bubbles. One lasted about three months til it finally stopped lighting up. No holes either, so it didn’t get water inside for that molding problem. Still enjoying 4 months later in the tub.