All machines at Respshop are dual voltage and support 100-240V AC power. You can use these machines anywhere in the world without the need for a voltage converter or transformer.
However, you may need a plug converter which can be purchased at drug stores, electronic stores and also big box stores for a relatively low price.
Are there DC/Battery operated CPAP machines?
Most CPAP/APAP/BiPAP machines are designed to operate also in DC 12V/24V, but manufacturers recommend using the machine without a humidifier for long-lasting operation. There are machines that have a specific DC power cord to connect from the battery to your machine, and some machine designs, such as Transcend and Z1, use a specific battery.