Specification: Color: Red 3 mode: Always, flsah, fast flash Battery by: 3V button battery (Included) Features: Waterproof, durable, steady, made of silicone. It works between 40 degrees below zero and 220 degrees. Always mode lasts 35 hours, flash mode lasts 160 hours. Easy to install or remove within 3 second. Can be installed on handles, seat cushion standpipe, backpack, helmet ect. Excelent company for hangging out at night hiking, cycling. Package Includes: 2 x Red Bicycle Light