Just press the metal button on the Instant Bottle Hand Warmer and in the blink of an eye it will be warm and ready to heat your hands. It holds the heat for 15 minutes, so it's perfect before going to bed or any other time your hands need it. You just need to put it for 10 minutes in boiling water and you're done. You can press the button again whenever you want and it will heat up in seconds. The exterior is made of durable fine plastic. Measures 12 x 7 cm, which will allow you to carry it in your pocket without problem. Take advantage of this offer and get the display with the purchase of 24 units.