The Colorful lightweight laser key chain is 2 2/14" 645nm, includes two LR-44 batteries and interchangeable heads. Catch "The DOT" is a fun and exercising game for your kitties..it helps burn off excess CAT energy. Play the dot game before bedtime with the cats. WARNING: DO NOT SHINE THE RED LASER IN THE PETS EYES. Aim at the floor or the walls. Kitties go bonkers chasing the uncatchable dot. The Laser Pet Toy is a favorite among cats. Muffin's is a 501 (c) FED. ID # 11-3369273 tax exempt Animal Service Organization. Thank you kindly. God Bless!