Rear Light USB Rechargeable Bike Saddle Bag Lamp Waterproof MTB Road Bike Tail Light Seat Tube Helmet Bag Taillights Product name: front and rear lights Light color: red/yellow Product model: ET-136 Battery: USB charging Material: plastic+usb Brightness: 20LM Battery: 22mAH Waterproof: life waterproof IPX5 Function: It can be used with helmets, and can also be used with rubber belts to fix seats, hang backpacks, bags, clothes, etc. Lighting mode: ( first gear is always on) (the second gear is fast flashing eight (the third gear is slow flashing) Specifications: Enjoy a safe night ride Highlight front and rear lights Replaceable button battery Three modes, whatever you want ways to use Package Included: 1 piece*tail light