Rechargeable hand warmers! Specs Magnetic 2-in-1 hand warmers: The UT3 Lite adopts four powerful magnets to attach the two twin hand warmers quickly and easily, making them compact and convenient to take on-the-go. Ultra light. Ultra Thin: With a thickness of less than 2 centimeters, UT3 Lite can easily fit into your pockets. They weigh only 65 grams each, making the pair 40% lighter than your iPhone. Instant Heat. Long-lasting: Heat release in just 5 Seconds, 3 temperature settings up to 131 degrees, Heat duration up to 4 hours. Premium quality: Excellent experience in every aspect. Safety certified temperature control chip, a single ergonomic button for all operations, a dust-resistant USB cover, and a silicone wrist band are all included. The Gift That Everyone Desires.