Heat-up in 7 Seconds: Made of high thermal conductivity of nickel-chromium alloy, eyelash curler heats up super quick and quite hot. Sturdy and long lasting^ Large Heat Release: Two temperature adjustments: one is 45-65 , another is 65-85 , practically fit for different occasions. The heat is what makes this curler amazing at producing dramatically swept-up curls in record time. You can sweep your lashes up to a gorgeous curve in one or two slow swoops^ Over-temperature Protection: Strip insulation groove design, much safer to protect your eyelid from the heating unit^ Elongated Brush Head with Curved Design: The deep, well-spaced grooves make it easy to hold your lashes in place as you gently bend them upwards, better fit lashes arc, create a long lasting and graceful curling effect^ Decent Battery Life: 3.7V lithium battery power supply, USB charging of cycle use, portable and more environmentally friendly.