Portland Design Works' Danger Zone Taillight will enhance your visibility like the beacon on a jetfighter with two 1/2-watt LEDs. It boasts three modes and includes seatpost, seatstay,. and backpack mounts, too. - ?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 - Weight: 57g (2oz)