Cygolite Trion 600: Triple LED Bike Light with Internal Li-Ion Battery Wireless LED bike light with 3 high-brightness LED bulbs 4 brightness modes: high, mid high, mid low, and low Fast, slow, walking, and SOS flashing modes for safety Rechargeable lithium-ion battery runs for up to 12 hours Quick-release handlebar mount; weighs 0.5 pounds