These festive caps have 1 flash function, the lights flash from left to right at a quick speed. To activate the blinking lights simply press the grey button to the side of the snowflakes. Dimensions: Height: 17.0 in. , 43.18 cm. – Width: 11.50 in. , 29.21 cm. – Cap Size: One size fits most. – LED Colors: 5 Red – Includes 2 replaceable AG13 Batteries.