Remove from water after your fun to ensure battery house stays dry.2. Twist and pull the blue cap on the end of the noodle, remove the battery casing, change them out and put the battery casing back in the same direction. Pop the cap back on, twist it and you're good to go. Specifications: Size: 52" x 2.5" LED Colors: Red, Blue, Jade Modes: Slow color change Batteries: 2 CR2032, Replaceable