Main Features:<br />The cycling tail light is used for outdoor cycling <br />With 7 flashing modes， it including normally on， quick flashing， slow flashing， left to right slow flashing， right to left slow flashing， left to right quick flashing， back and forth flashing between left and right <br />2 modes laser parallel lines， including normally on and flashing  <br />Powered by 2 x AAA battery (removable， not included in the package)， it can work for 9 - 36 hours <br />Input power: 100mW<br />Seat post diameter: 20 - 36mm<br /><br />    Specifications<br />General<br />  Color: Black                                                  <br />                        Suitable for: Electric Bicycle， Touring Bicycle， Mountain Bicycle， Fixed Gear Bicycle， Road Bike， Cross-Country Cycling                                                  <br />                        Placement: Tail                                                 <br />Parameters<br />  Power Supply: 2 x AAA Battery                                                 <br />Basic Information<br />  Product Weight: 0.046 kg                                                  <br />                        Packge Weight: 0.090 kg                                                  <br />                        Product Dimension: 7.5 x 7 x 3.5 cm / 2.95 x 2.75 x 1.38 inches                                                  <br />                        Package Dimension: 10.5 x 7 x 4.0 cm / 4.13 x 2.75 x 1.57 inches                                                 <br />Package<br />  Package Contents: 1 x Cycling Laser Tail Light， 1 x Fixed Base                                                 <br /><br /><br /><br />                                            <br /><br /><br /><br /><br /><br /><br /><br /><br /><br />                                                <br />