Electricity in Switzerland
Swiss outlets supply the European standard voltage of 220-240 V AC - 50 Hz. If your equipment does not support this voltage, you need an adapter that converts the voltage.
Swiss plugs and wall sockets
Swiss plugs and wall sockets are shaped rather unusually. There are non-grounded wall outlets with 2 holes and grounded wall outlets with 3 holes. The non-grounded European plug with two pins will often fit in a Swiss wall socket. But not all the time as the European prongs are slightly bigger! Other plugs will mostly not fit, so an adapter is needed.
Resellers of Swiss adapter plugs