What You Get:1 x Safety warning lamp Features:Adopts premium light beads, bright with long service life. 4 modes can meet your different needs. Excellent waterproof processing that ensures the safety of battery compartment, switch is sensitive and waterproof. With built-in battery, and supports USB charging, very convenient to use and energy-saving. Make your bike highly visible so that it can guarantee your cycling safety. With one quick release mount, easy to install on bike seatpost. Specifications: Material: Plastic Color: Shown as picture Options (Light Color): Red; White Light Bead: COB Luminous Flux: 50lm Mode: steady / slow flash / super flash / cycle flash Power Supply: Rechargeable 3.7V 330mAh Battery (built-in) Charging Time: 2hrs Working Time: 12hrs Waterproof: Rainproof Size: Approx. 7 x 2 x 1.7cm / 2.75 x 0.78 x 0.67inch Weight: Approx. 52-53g