Size (length x width x height):Shell material: PCNet weight: 40 plus-minus 0.3gPower supply: USBBulb type: COBE bulbPackaged: colour boxType: tail light, warning lightFeatures: easy to useBase:ABS05Maximum light output: 100LMBattery type: lithium battery 3. 7V 600MAHWaterproof: IPX6Gross weight: 54 plus-minus 0.3gPacked size: 71x63x44mmLighting mode: red light white-red white colour change, red white-red blue colour change, 100% red light, 50% red light white/blue Red Flash, SOS Mode, Bi-colour FlashCharging time: 2 hoursWorking time: 3. 5 hours (fully charged)100% long life: 7 hours50% long life: 13 hoursBicolour flash: 11 hoursHighest brightness working time: approx. 35 hoursLongest lighting time: 145 hoursFor 4 lighting modes: press the button for 3 seconds to open the Lighting Mode, and press it again for 3 seconds to close itWhite/red flash 100%White/red burst flashWhite/red 100% long durationWhite/red 50% long durationNote:1. Please allow 1-3cm/ 0.39-1.18in difference due to manual measurement and 3-5g/ 0.007-0.01lb/ 0.11-0.18oz for the difference between different colours2. Due to the screen difference, the colour may be a little different to what you expect, please allowPackage includes:1 x bike tail light