Topeak WhiteLite II 3 Bright LEDs, (2) CR2032 Battery (Included) Control 2 Modes. Constant / Blinking Burn Time (approx) 60 hrs / 100 hrs Size (L x W x H) 5.8 x 3.5 x 3.5 cm / 2.3 x 1.4 x 1.4 Weight 24 g / 0.84 oz (light only)