Will your trick-or-treaters be brave enough to knock on your door this Halloween? Add this scary skeleton door knocker and find out! Each sound-activated knocker has eyes that glow with eerie green light while they emit chilling barking and meowing noises. Hooks on the top make hanging easy. Each includes 3 button cell batteries and on/off switch. Plastic. 5 3/4"L x 4 1/2"W x 7 1/4"H. Choose Cat or Dog.