Can you use a 220v device in a 240v country?

In general, yes. There are three things you need to concern yourself with when using electric or electronic devices in other countries: # The voltage

Most, but not all devices have a tolerance that will accept a range between 220 and 240 volts. Many modern electronic devices accept a voltage range from 110 Volts to 240 Volts.

# The frequency

Some devices - especially anything with a motor built into it - will only work properly if supplied with an alternating electric current of the specified frequency. In North America, the frequency is 60 Hz, in Europe it is 50 Hz, and it varies elsewhere. Even if you have the correct voltage, plugging a motor into a supply with the incorrect frequency can damage the motor.

# The plug form factor

Plugs differ from country to country, even when those countries use the same voltage and frequency. Without the correct plug adapter, you may not be able to plug your device into another country's power receptacle.