Hold Space Click "See Inside" to change the speed 1st Gen: Flat base, low pitch gong. 2nd Gen: Stair-step base, higher pitch, old logo on back door. 3rd Gen: Posseses same qualities as 2nd Gen, but newer logo on back door, and improved internals. (NOTE: THIS INFO MAY NOT BE CORRECT, THIS IS JUST MY UNDERSTANDING OF THESE BELLS.)
CREDITS: Audio by @vmotati10