This helmet with in-mold construction makes it extremely durable. The LED lights make it visible from 360 degrees, keeping you safe at night. It is a great choice for bike riding.    Features:  In-mold construction with hard PC shell and EPS lining for impact resistance and protection.  20 LEDs increase visibility from 360 degrees, keeping you safe at night.  Turn signal lights and stop lights are easily controlled by the remote control.  23 air vents keep you cool and comfortable, and reduce the weight of the helmet.  Adjustable dial system makes the helmet fits head circumference: 54-61cm (21.2"-24").  Includes a helmet, charging cable, remote control, remote mount, rubber band and user guide.    Specifications:  Material: PC + EPS  Color: Black / White / Blue / Dark Grey / Fluorescent Yellow (optional)  Vents: 23  Head Circumference: 54-61cm / 21.2-24in  Helmet Battery: 3.7V 500mAh lithium polymer rechargeable battery  Charging Time: Approx. 3 hours  Battery Life: 3-5 hours, depending on settings  Modes: Solid mode, Flash mode, Extended flashing mode  Remote Battery: 3V CR2032 battery  Weight: 300g / 10.6oz    Package List:  1 * Helmet  1 * Charging Cable  1 * Remote Control  1 * Remote Mount  1 * Rubber Band  1 * User Guide