Rest assured - a pool alarm wrist band kids will love to wear! The replacement wrist band omes complete with a key for locking the buckle on the wrist band comfortably around your child's wrist. While children enjoy wearing the colorful Turtle Wristbands, rain or light spray won't trigger the alarm - sold sperately. The Turtle is permanently sealed and rugged to withstand children's play and works within a 100-ft. range. The Turtle has a non-replaceable battery that lasts up to 3-4 years of normal use. The Safety Turtle system can be progressively expanded through the purchase of additional wrist bands of the same color.