Overall they are great & work well. They are easy to use & I love the colors. Don't have to worry about them walking off. However so far I've had 3 that don't work. Two didn't work out of the package & 2 stopped working after the first use so you might want to order extra.
Complete and total junk. Bought these for our summer swim team and they quit working after 1 meet. Now they keep going off in my house every night. To make matters worse, I went to return them and I am ONE DAY out of the return policy. Don't buy!
I was looking to use these for a 5k we are hosting and when they came in I was surprised at how cheap the are built! They are little better than toys. One of them either doesn't work or has a dead battery already. I'll need to use them this year but I doubt they will last until next year let alone through the race. Very disappointed for the amount I spent on them.
I was right! By the second year none of them worked!