Bicycle Parts Specifications: LED Quantity + lamp bead model: 16*LED Focus / fixed focus: fixed focus Lighting distance: 100m waterproof: life waterproof Gear position: 5 Gear (Fast, meteor flash, chasing flash, slow flash, burst flash) Lighting duration: (flashing 8 hours - slow flashing 50 hours - meteor 30 hours - chasing flash 30 hours - breathing 8 hours) Switch position: middle of the lamp body Support battery type: built-in lithium battery Charging Method: USB Light Size: 40* 40 *20 MM Material: ABS Color: Red/Blue/Gold/Grey/Black Waterproof Level: IPx5 Suitable for: Night warnings, Cycling, Running etc. Can be hung on a bicycle helmet. for 12-26mm pipe diameter. Package Included: 1 X Bike Tail Light 1 X USB Charging Cable 1 X Rubber Holder Highlight LED lamp beads 5 flash modes USB fast charging Long time Endurance MAKE THE REAR VEHICLE VISIBLE Remind the rear car, Keep a safe distance, Avoid causing personal safety ADD 0.5 SECONDS FOR SAFETY VISIBLE DISTANCE UP TO 215M+ HIGHLIGHT LED LAMP BEADS 20 LUMENS USB FAST CHARGING BATTTERY CAPACITY 220MAH Fully charged after charging for 2 hours, up to 56h use battery life RAINPROOF DESIGN REMEMBER TO DRY AFTER THE RAIN MINI FASHION STAR- SHAPED APPEARANCE, MORE BEAUTIFUL Round height 40MM , 25MM wide, Mini, Easy installation MULTIPL E WAYS TO WEAR ROUND/FLAT BODY STEM, LANYARD TAIL BAG, HIKING BACKPACKS, ETC.