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1. Environmental-friendly.plam and portable2. operation time:6-7hours(low),3-4 hours(high)3. surface temperature:39-48C charging time:3-5 hours4. charging by USB port or USB adaptor(DC 5V,1A)5. Built-in rechargeable LI-ion battery
6. Hand mini warmer is best product used in winter
USB mini cute rechargeable hand warmer good gift for parents and children