Waterproof design makes it not easy to damage by rain to extend service life. High brightness LED lamp bead brings good lighting effect. USB charging design allows you to charge with power bank or phone charger anytime and anywhere. Large capacity battery design ensures a long endurance. It is made of quality plastic and resin material. We have various styles for you to choose. It is suitable for bike. Item Name: Saddle Taillight Material: Plastic, Resin Battery: 500mAh (Included) Features: Waterproof, Mini, Compact Size Details: Style A/B/C/D/E/F Size: 11cm x 3.5cm x 8cm/4.33" x 1.38" x 3.15" (Approx.) Style G/H Size: 6cm x 3cm x 2cm/2.36" x 1.18" x 0.79" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: ABCDEF: 1 x Light 1 x USB Charging Cable 1 x User Manual or G: 1 x Saddle Mount Style Bracket or H: 1 x Seatpost Mount Style Bracket