Features: 1. Multifunctional Helmet Waterproof Bicycle Tail Light 2. Bicycle Rear LED Light 3. Built-In Lithium Battery USB Charging 4. 4 Modes: Steady Light, Slow Flash, Sequential Flash, Strobe 5. Super Waterproof, High Brightness, Energy-Saving Led Description: 1. Product Name: Usb Charging Signal Light 2. Mode: Constant Light, Slow Cycle, Flash, Fast Cycle 3. Lamp Holder: Super Bright Led Lamp Holder 4. Use Time: Charging Time Is 3 Hours, Use Time Is 4 Hours 5. Power Supply: Battery 6. Advantages: High-Brightness Led Light, Using Rechargeable Physical Polymer Battery, Automatic Full Charge Cut-Off System, Smooth And Stylish Design, Sealed And Waterproof. type: B-1 x Helmet Signal Light+1 x Data Cable+1 x Buckle Signal Light: Blue Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use Material: plastic colour: As Shown Package Contents: 1 x Helmet Signal Light 1 x Data Cable 1 x Buckle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.