Overview: Easy on-off mounting Integrated Bike Mount 2 Yellow LED 2 Red LED flashing effects when push the power switch Powered by 2 AAA batteries (included) 120db Loud electronic signal penetrates traffic noise Lightweight, weatherproof Impact resistant This item may ships in other colors if the blue color one is unavailable Specification: Dimensions: 2.05 in x 1.73 in x 2.56 in Weight: 3