This is a "Role Play" or dress-up mask. It should be found in among the Boom toy section at Toys R Us. It's easy to tell what's going on here, they altered the original mask to give it the extra tiny 'boom spikes' there on the side, made the nose a little bigger, and took the eye white out replacing it with clear. The original mask usually had a see-thru perforated white area to complete the look, with piercework in the color & black part of the eye to further assist seeing out of the mask.
Here's the interior of the "Light Up Sonic Mask" from page 1 of misc. Boom items. Nobody ever figured out why the mask lights up, Sonic's face never glows in the game & he doesn't seem to have light based powers...ever. Either way, you can see the battery panel there on the forehead, & that all 3 straps are adjustable so any size head can wear it. The nose goes under the eye-bridge there, near the actual mask's nose part. It looks pretty solid/normally built. Remember: this is based on Jazware's Modern Sonic mask, but modified to make it 'Boom'.
