USB Charging LED Light Up Acrylic Coaster Transparent Crystal Base 1. Material: transparent acrylic + electronic components 2. Light color: white light (three-segment flash), colorful (three-segment flash) 3. Function: colorful, luminescent and color-changing; alcohol and beverages enhance the atmosphere 4. Power supply: built-in battery for USB rechargeable models 5. Battery capacity: 400mah polymer lithium battery 6. Use time: charge for 1-2 hours, discharge for about 8-10 hours 7. The waterproof design of the cushion body, the acrylic material does not leak electricity 8. High light transmittance, better brightness and effect 9. The edges are polished carefully, without cutting hands 10. The charging port is integrated with the switch. The switch is a touch-sensitive switch. Long press for 3 seconds to switch on and off, and short touch to switch modes and colors 11. Size: round 100x410mm; square 100x410mm; octagonal 100x410mm