Here's a hard plastic, one-size-fits-most ring rendered in the shape and likeness of the power rings wielded by Sinestro and the rest of his mustache-twisting Sinestro Corps.!  Man, they take the coalesced fear of all sentient beings and channel that power into giant, yellow, hard-light tennis rackets to beat the hell out of more affable life forms.  But you could care less about that.  You're here because these rings....light up!   Turn the ring upside down and use the side ridge on the included key to switch the light-up function on or off! 

The face of the ring measures about .75" across in diameter and about 1.5" high from the top of the face to the bottom of the band.  Each ring is powered with a replaceable CR 927 Lithium battery that can be....replaced.  If you're one of those handy-types, there are easy to follow instructions for replacing the battery (and operating the ring) on the flip side of the card.  These were one-time exclusives to the New York Comic Con, hence the higher price, but now....we got em'!  Bzzzt!  That's the joy-buzzer!

Are you a fan of Green Lantern, or do you prefer the aforementioned, mustache-twirling avatar of fear?  The latter?  Then this is the ring you should probably "Add to Cart."