A MUST FOR EVERY DOG OWNER, THIS LITTLE COMB REQUIRES 2 AAA BATTERIES (NOT INCLUDED). IT WILL GIVE A TICK OR A FLEA A LITTLE "ZAPP" ELECTRICAL SHOCK, BUT WON'T HARM YOUR DOG OR CAT THEY WON'T EVEN FEEL IT. THE PRODUCT ALSO HAS STRONG LED LIGHT SO YOU CAN SEE WHILE YOU USE IT ON YOUR PET. THE FINE TOOTH COMB WILL THEN REMOVE THE INSECT. 4.5" L X 3" W X 0.75" THICK