Ancient Personal Shield

Personal shield generator of Ancient design, found by Rodney McKay in a laboratory in Atlantis. Nicknamed "The Turtle Broach" by production, this item was introduced in Season One's "Hide and Seek," and was subsequently depleted in the same episode. It was also see in Season Three's episode "Irresponsible". An alternate Rodney "Rod" McKay used his reality's personal shield generator to survive a trip into our universe to warn us of the effects our experiments were causing in his reality.
Technical Description:
Production made translucent green resin device with painted silver frame structure, has three magnets on back, measures approx. 3.25in x 2.25in x .1in.