There are restrictions for any of the manual devices. It must be worn on the outside of your clothing or vest. You must either pull the landyard which activates a co2 cartridge, or inflate by using the Oral Tube. T his particular device is for adults and not for kids. The point is this little device will keep your head out of the water, and very well could save your life - especially if you are out fishing alone.
Retail price is about a hundred bucks.