Features: 1. Adopted premium acrylic material, non-toxic, safe, scratch-proof and anti-corrosive. 2. Energy saving solar charging, a great way for who had trouble finding your cup holder when driving in low/dark light conditions. 3. No installation is needed, just need to place it in the sun, filled with electricity, so that the light can be turned on in the evening while automatically turned off during the day. 4. Dual charging modes, solar charging and usb charging port. Convenient and suitable for all kinds of vehicles that come with car cup holder. 5. Lightly tap the switch to change color modes(Up to 17 color conversion modes). Gradient: Red&Green/Blue&Green/Red&Blue; Breath: Red/Green/Blue/Yellow/Purple /White/Ice-blue; Long Bright: White/ Red/Green/Blue/Yellow/Purple/ Ice-blue. Specification: Condition:100% Brand New Material: acrylic + Solar Panel Color: RGB Light Diameter: approx.6.8cm/2.7in Weight: Approx.90g/3.2oz Package list: 1 * Cup Mat 1 * USB Cable How to use: 1. Press the button on the back of product for 6 seconds then you can turn on the switch; 2. Then put the bottle on the top, and the gravity induced light will be lit up. 3. Press the button for 6 seconds to turn off. Note: 1. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.