Various options/patterns with Dual lights (around ears and bow) two battery packs for optimizing 60 lights for this ear. Easily accessible for quick change when needed. 3V (coin) batteries can be purchased at multiple places. Ours will come from the factory and will always be tested before shipment. We always recommend bringing extras (not included) in the event you would need to change them.  The factory ones last a decent amount of time, but we have had those rare occasions where someone forgot to turn them off. We always encourage our customers to have some extra batteries on hand.