Made of high quality material; The light will be off when the vehicle stops、 on when it runs、 and flash when you are driving at night; Bring more enjoyment to your drive. Power by 3 x L1131 batteries (included) Dimensions: 2.36 in x 0.79 in x 0.59 in (6.0 cm x 2.0 cm x 1.5 cm) Weight: 0.92 oz (26 g)