Why Oumers: Oumers INC. mainly engaged in the development and export of outdoor products. Products of high quality, stylish design. Oumers has always adhered to ” High quality products, good customer experience” business purposes. Committed to providing you with high-quality products and quality services. Specifications: Brand Name: Oumers Material: ABS, 7 foot long string of 20 LED bike lights Power Supply: 2 x AA battery (included) Weight: 2.8 ounces (super lightweight) 2 Modes: switch from “steady” to “flashing” Our Bike Wheel Light—lightweight, improve the safety, won¡¯t affect riding speed & gravity force! This bike spoke light is only 1.4 oz (This weight not include batteries). Lightweight won¡¯t affect riding. Normal bike lights can only be seen from the front and back, but our oumers Bike Spoke Light can gain increased visibility from all directions whether you¡¯re moving or not, ensure your safety in low light conditions! Waterproof construction designed for daily use in all weather conditions, Which is also the perfect way to increase your visibility and cool factor when you’re riding your bike in the dark. Of course, water and shock resistant. Warm Prompt: If you have any product issue, pls contact us when you received package. We will do our best to help until this is fully resolved. Have a good day!