A method and device for creating and maintaining a personalised bubble of scent, the method including: providing a wearable device including a perfume reservoir, a perfume dispenser coupled to the perfume reservoir, and a controller to dispense a volume of perfume from the device at intervals; controlling said wearable device to dispense a pulse volume of scent from said perfume reservoir at a pulse interval; and determining said pulse volume and said pulse interval to maintain a mass per unit volume concentration of said perfume above a threshold level within a defined radius from said wearable device.