Please be aware that whilst a travel adapter will allow you to physically plug a US plug into a different outlet it will not change the voltage or frequency of the supply.
Voltage - The mains voltage in Czech Republic is 230 V which is incompatible with most US appliances (US voltage is currently specified as 120 V + /- 5%). Check any appliances that you wish to use carefully to see what voltage is specified. Items such as laptops will often specify "100 - 240V" either on the equipment or the power supply (if it has one). If not then you will need a transformer to operate your appliance. If it is not marked as able to accept the local voltage do not plug it in! It is extremely dangerous to attempt to operate appliances at higher voltages than they are rated for and may result in damage to the appliance, fire and serious injury to the operator
Frequency - The frequency is 50 Hz which is slightly lower than in the US (which operates at 60 Hz). In practical terms this makes little difference as most travel appliances will run at either frequency. Some items with motors, such as hairdryers and some clocks will run a little slower than intended but it is not likely to be problematic. Check your device - it may say 50/60 Hz which indicates that it is compatible with either frequency. If you are in doubt or you have sensitive or expensive equipment check with the manufacturer first as some equipment may be damaged by running on an incorrect frequency. Neither travel adapters nor transformers are able to change the supply frequency.Special considerations - "Type E sockets are standard, earthed appliances ship with an E+F plug. Type C Plugs are common, especially for low-power devices. Type C wall sockets (actually E without the grounded pin and with narrower holes) are very uncommon, and exist only in very old installations."
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