Make some noise, have a Flashing Whistle Party! Blue, Green, Peach, Purple, just don't be tardy. You wear them at night on a string around your neck. How about you blow it while dancing to Beck. Dimensions: Length: 2 in. , 5.1 cm. Height: 1 in. , 2.5 cm. Width: 1 in. , 2.5 cm. String: 28 in. , 71.1 cm. Packaging Dimensions: Height: 5.1 in. ,13 cm. Width: 3.5 in. , 9 cm. Depth: 1.25 in. , 3.2 cm. LED Colors: 1 Blue, 1 Red, 1 Yellow Batteries: Batteries are NOT Replaceable.