BrickLink - Part 4774c01 : LEGO Electric, Sound Siren 9V 2 x 2 x 1 1/3 with Two Town Police / Fire Noises [Electric, Light & Sound] - BrickLink Reference Catalog
LEGO Alpha Team Scorpion Orb Launcher (4774) for sale online | eBay
LEGO® 4774c01
LEGO 4774 Scorpion Orb Launcher Instructions, Alpha Team
LEGO 4774 Scorpion Orb Launcher Set Parts Inventory and Instructions - LEGO Reference Guide
LEGO part 4774c01 - Black Electric, Sound Siren 9V 2 x 2 x 1 1/3 with Two Town Police Noises at BrickScout