Moods2go Portable USB Aromatherapy Diffuser. Use it in any USB port like a laptop, car charger or usb plug in a wall socket. Diffuse your favourite essential oils anywhere. Squeeze the Uplifting blend straight into the refill bottle when you slide off the back, fill it half full, screw on tight and pop back in securing the back. The FOCUS blend is made of PEPPERMINT & ROSEMARY. This blend is very fresh, alert and stimulating; helping the mind focus on even the most complex of tasks... read more about it under each individual blend bottle.