3392B25 Drive Unit is for 120 V, 50 or 60 Hz, 0.4-hp, with 3-wire cord and plug; as supplied with Thomas number 3390D25 blender, takes 3392D07 series glass jars.
3392B35 Drive Unit is for 240 V, 50 or 60 Hz, 0.7-hp, with 3-wire cord, but no plug; as supplied with Thomas number 3390D35 blender, takes 3392D07 glass jars.