From the manufacturer:

Easy to use with a battery-heated element to curl lashes quickly and comfortably Beauty Eyelash Curler is made of a silicon pad that heats up to a safe and comfortable temperature for effective curling top lashes. The silicon pad changes to white when the Eye Lash Curler is ready to be used Creates long lasting curl in seconds. Set eyelashes in place for 10-15 seconds depending on the degree of curl desired Push the centre "button" open to turn the Heated Eyelash Curler on.