Specifications Key Features :Bicycle Tail Light, Rear Lamp Battery :2 x CR2032 battery (not included) LEDs :2 LEDs. Function :Waterproof. 4 Kinds of Switch :Full light, flash, slow flash, off Button: One-Touch switch design, easy operation. Body Material: Flexible waterproof silicone. Lit Time :All the sustainable use of light 35 hours. Scintillation sustainable use of 160 hours. Dimension :3.62" x 1.18" x 1.18" (L x W x H). You can use it for :Outdoor activities, like biking / hiking.
