This brass Diving Helmet holds a beautifully detailed brass wish box. Inside the wish box is a 3/4 diameter LED light that fades on and off in a vibrant shade of royal blue. It is powered by 2 CR1220 lithium cell batteries which are included and replaceable. The Diving Helmet Light Up Necklace hangs from a 18" brass colored chain. The diving helmet measures 1.5 inches long and 1 inch across. The dangling wish box adds another inch and a half to the length. The perfect gift for all who love nautical jewelry.