Railroad crossing sign flashing light blinking button would sure add a smile on your little engineers' face. Show off your love of railroading by wearing with this blinking railroad crossing pin. Flash light blinking buttons will always put you in the spotlight and is sure to attract attention every place you go. Will operate for over 100 hours of fun!!! Recommended for ages 8 and up. Replacement battery AG-3 which is a common name and is identical to a LR41 battery.