This handheld nebuliser is light, portable, quiet and convenient - making it ideal to take with you when travelling. It includes both an adult and child sized face mask and can be operated with either 2 x AA batteries or the USB cable supplied. This device is extremely simple to use, featuring a one key use. It is also very easy to maintain using the self-clean function. To use add 8mls of liquid for the device to work for 16 minutes.