It highlighting the flavor of fashion and technology. Super waterproof, rubber covered button expansion. Multinational design to meet the functional requirements of riding. Super energy-saving, USB interface to charge, you can charge and discharge back and forth.Silicone strap design,suitable for various thickness of the seat tube 1.5-3.2CM,fine front fork all can use. USB rechargeable bicycle rear light, built-in lithium-ion polymer battery.Using a high-power light segment 8.8cm long lighted (with 26 SMD light highlighting composition), matched crystal grade transparent acrylic shade, light irradiation distance, 2000 meters at night, during the day and still visible, while Quanta degree viewing angle 250, fully protect your ride safe, can be used as lighting use