Automatic operation: Press the button once and all dice in the cup roll automatically. Users can open the transparent lid to replace dice. Opaque lid design: The soft base reduces noise from dice rolling. The second half of the opaque lid ensures your dice aren't visible to others. PP material: The automatic dice cup is made of premium PP material, robust and durable, not easily damaged. Adults and children can play safely Battery-powered: This electric dice cup is powered by 2 AA batteries (batteries not included). Lightweight and compact, comfortable to carry. Multiple applications: This electric dice cup is suitable for all party dice games, an excellent choice for KTV, bars, parties, and other entertainment activities. Product type: Automatic dice cup Material: PP Weight: Approximately 171g/6.0oz Product size: Approximately 11.5x10.6cm/4.53x4.17in Battery type: Alkaline batteries (not included) Battery model: 2 x AA batteries