Product Features Dual Warmth Options: MagTwins rechargeable USB hand warmers offer split magnetic design. With a 270 setting for heating and 90 for magnetic absorption, they can combine for 360 heating all day long. Double Battery Power: Each MagTwins piece features a 5000mAh rechargeable battery, delivering over 8 hours of heat on low or charging your phone 1.5+ times. Rapid Heating: MagTwins provide quick 3-second heat release with a single button. With a 20% power density increase, it offers efficient, even heat distribution. Versatile Heat: Choose from 4 temperature levels up to 136?. MagTwins remembers your last chosen heat level, simplifying your operation for next time.