THIS IS AN AWESOME 1 TO 1 PROP REPLICA OF THE BEACON LASER/ SOLDERING TOO/ DEFENSIVE RAY GUN FROM THE ORIGINAL SERIES. IT RUNS ON A 9V BATTERY LOCATED IN THE INSIDE. THIS HAS NO SOUND FX BUT THE PULSATING ARRAY OF LIGHTS EMITTING FROM THE TO. THIS PROP REPLICA WAS USED TWICE I9N THE DOOMSDAY MACHINE AND THE SQUIRE OF GOTHOS AS WELL. COMES AS SEEN WITH BATTERY INSTALLED. GREAT COLLECTABLE FOR TH AVID STAR TREK PROP COLLECTOR.