Neca Nightmare On Elm Street Freddy Krueger Solar Power Body Knocker Coming from Neca. It's The Solar Power Body Knockers - Movies - Freddy Krueger. Enjoy hours of body-bobbling fun thats powered by the sun! Body Knockers rock from side to side when exposed to light, they never need batteries! They stand 6" tall. Collect the entire line watch your favorite characters dance the day away!