Laser Bicycle Taillight

This bicycle taillight is made of AL shell, Laser light inside. There are three models of the light. Click the button once, it will light up always, click again, it will flash fast, and click third, it will flash slowly, and click fourth, it will turn off the light. It works with 2 pcs button batteries. 2 3/4" L x 3 1/8" W x 1 3/8" H