Features: Enhances hand eye coordination and memory skills with this adorable small interactive keychain featuring engaging memory challenge games and portable pocket sized design. Crafted from durably, lightweight plastic with a clip on attachment, this pocket sized game console combines brains training functionality with kid friendly drop resistant construction. Perfect for students improving concentration, professional seeking mental breaks, and families wanting interactive parent child bonding through cognitive games. Carry your portable brains trainer on keychains during commutes, clip it to backpacks for outdoor adventures, or enjoy quick memory boosting during coffee breaks. The ultimates travel sized cognitive development tool doubles as educational gift that transforms idle moments into productive brains exercise opportunities for all ages. Specifications: Materials: Plastic Package Includes: 1 × Fun pendant 2 × Coin Battery LR44 (Built-in) note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.