Features Use 4pcs high quality LED Bicycle rear light, super bright bike rear rack light. With 2 modes,one is steady,one is flash. Use 2pcs AAA batteries,easy to replace. (Battery not included) Up to 60-80 hours Including bike reflector,improve safety. tool-less installation on the bicycle carrier, 100 meter visibility, Distance between 2 screws: Adjustable,from 50mm to 70mm is ok. Enjoy safety in rain, snow even thunderstorm extreme weather Advantages 1: Screws are removable,can fits for most kind bike carriers. Advantages 2: Bicycle rear light use 4pcs high quality led,very good for use as bike rack warning light. Advantages 3: This bicycle rear light use 2pcs AAA batteries to work ,easy to replace. Working time up to 60-80 hours. Advantages 4: Including one bicycle rear light and one bike reflector. Even your battery have no power,can ensure use it as bike warning light. Package include: 1*Bicycle rear light 2*Screws Warning:The batteries are not included The second choice:With strap mount on seat post We offer another mount way for customer,you can install the light on seat post. Service Policy Warranty Term: 1. Return is accepted if it's quality problem or wrong item sent, we will pay the shipping cost. If it is not quality problem, customer is responsible for all cost including shipping fee. Please return within 7 days after receiving if our bicycle light have problem. 2. Attention: Please keep the items in original conditions and take pictures of the defective point, then contact us before sending it back. Shipping Methods: 1. Shipping out within 1-5 working days. 2. It usually takes about 14-29 days (by Registered Airmail), 5-7 working days (by Express Shipping) to most countries, and can be longer due to strict customs Inspection 3. According to our experiences, customs duty may be charged at your side, please note that buyers are responsible for all additional customs fees, brokerage fees etc. that may occur during passing through customs inspections in destination country Feedback: 1. Your satisfaction is the most valuable thing we are pursuing, if anything unexpected happen, we are always ready to serve you and solve it with most reasonable solutions. 2. You are also welcome to contact us at anytime, all messages will be replied within 24 hours, we will do our best to bring you a happy shopping experience.