If bought with batteries  you will get the correct amount of batteries for all the switches bought.

The 2 cob light switch will require 3 x AAA batteries per switch

The 4 cob light switch will require 4 x AA batteries per switch

Batteries

AA Alkaline batteries providing long lasting, dependable power across a wide range of everyday applications. • Non-rechargeable, mercury and cadmium free • 5 Year shelf life

AAA Alkaline batteries providing long lasting, dependable power across a wide range of everyday applications. • Non-rechargeable, mercury and cadmium free • 5 Year shelf life

Brand of batteries may vary