HEATFOX heated glove liners, it can be great for people who with Raynauds or Arthritis. Heated gloves liners also is the best glove liners to used with winter gloves such as ordinary ski gloves snow gloves etc. INSTRUCTION FOR USING ● For the first time wearing gloves we recommend that the battery be fully charged. During first charge, when the charger LED light turn green, keeping charge 30 minutes extra; ● After connecting the batteries and gloves, press the switch button(l-3 seconds) to start heating, press the buttons to adjust the heating levels; ● 3 level (high-middle-low)intelligent heat setting，inner temperature up to 50°c (122°F) on high; ● Batteries need to be charged before storage and at least charger once every 3 months of storage thereafter to prolong the battery life.