Features: 1. These lightweight lights are very easy to install and remove. 2. Enhances riding safety by increasing visibility at night and during bad weather conditions. 3. Securely fitted to the 16-23mm bicycle stopper. 4. Two batteries for one LED light, the batteries has 30 hours duration. 5. With sealing rings in the waterproof case, enhances the waterproofness. 6. Simple and convenient to keep it with you, a good assistant for bicycle decoration. Specification: Condition: 100% Brand New Item Type: Bicycle Handle Bar Light Material: Silicone + PC Battery: 2 * CR2032 Button Batteries for Each One (Batteries are included) Two Batteries Service Time: 30h (One Light needs two batteries) Mode: Low Frequency Highlight, Flashing Waterproof: Yes Scope: for 16-23mm Handlebar (Inner diameter) Color: As Shown in The Pictures Size: Approx. 6.5 * 3.0 * 1.5cm / 2.6 * 1.2 * 0.6inch Weight: Approx. 85g Package List: 2 * Bike Handle Bar Light How to Install: Tighten the adjusting nut upwards to squeeze the expansion rubber ring, increase the rubber and the inner diameter of the handlebar to achieve the expansion installation effect.