1.USB recharageable hand warmer 2.best product in cooling winter . 3.USB charge.plam and portable 4.built-in recharge batte

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 warmer is best product used in winter

USB recharageable hand warmer