The Portland Design Works Danger Zone Tail Light two bright LEDs to attract attention from the rear. Features: Two 0.5 watt red LEDs by Nichia Brand Three modes: zZz, a-HA!, and Rock Steady Up to 50 hours run time on 2xAAA batteries (included) Includes Stayputnik seatpost mount Weatherproof exterior for all season riding Specifications: Brightness: - Battery Type: AAA Run Time: 50 Hours (Max) Beam Color: Red Color: Black Weight: 57g