Miniatronics

8 Ohm Speakers -- 3/4" 19mm Round x 3/16" 4.7mm High (Fits N & HO scale)

8-Ohm Speakers -- 7/8" 22.2mm Round x 5/16" 7.9mm High (Fits HO, O, G & 1 Scales)

8 Ohm Speakers -- 1-1/8" 2.8cm Round x 9/16" 14.2cm High (Fits HO, O, G & #1 Scales)

Digital Command Control Speakers -- Oval 15 x 25mm, 8 Ohm, 1 Watt

Digital Command Control Speakers -- Rectangular 16 x 35mm, 8 Ohm, 1 Watt

Digital Command Control Speakers -- Rectangular 20 x 35mm