BrickLink - Part 92914c01 : LEGO Duplo Siren with Light and Sound, 1 x 2 Base with Red 2 Stud Button on Top and Trans-Dark Blue Light Covers [Duplo, Vehicle] - BrickLink Reference Catalog
BrickLink - Part 39787c01 : LEGO Duplo Siren with Light and Sound, 1 x 2 Base with Trans-Dark Blue Lights, Curved Edges and Red 2 Stud Button on Top [Duplo, Vehicle] - BrickLink Reference Catalog