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 stars. Dimensions: Height: 16.0 in. , 40.64 cm. – Width: 12.00 in. , 30.48 cm. – Cap Size: One size fits most. – LED Colors: 5 Red – Includes 2 replaceable AG13 Batteries.