PetSafe Dancing Dot Laser Cat Toy features a Certified Class 1 laser that's completely safe for your cat to play with; toy requires 3 AAA batteries (not included). One-Time-Play and Play-All-Day modes give you options to keep your kitty entertained， even while you are not home. Place the toy on a raised， flat surface or hang it from a doorknob for wider and faster laser movement. In Play-All-Day mode， the play sessions last 15 minutes each with a rest mode between to prevent your cat from being over-stimulated.