1.Single led,Super bright 2.Constant mode/Flashing mode 3.Power: CR2032 3V battery 1. Material: Silicone ultra bright LED bike safety rear light2.Size: 20mm-40mm3.Flexible silicone body .4. Led Color: Red, Green, Blue .etc5. Surface Color: Red, Green, Blue .etc6. CE & RoHS certifiedCan be mounted on handlebar, seat, helmet, wheel, hub, etc. Safty bicycle rear light