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New Retro Rechargeable Hand Warmer 2-in-1 Double-Sided Heating Large Capacity 10000mAh, Best Choice for Cross-Border E-commerce. Switch function: 1. Press and hold the hand warmer button (right) for 3 seconds to activate the first level of 40-degree heating function, which displays level 1 immediately and 40 degrees after three seconds 2. Short press the hand warmer button (right) once to activate the second setting, which has a 50-degree heating function. It displays the second setting immediately and shows 50 degrees after three seconds 3. Short press the second hand warmer button (right) to activate the third level of 60-degree heating function, displaying level 3 simultaneously, and displaying 60 degrees after three seconds 4. Press the hand warmer button (right) again to cycle through the 40-degree heating function, displaying level 1, and after three seconds, it will display 40 degrees 5. Press and hold the hand warmer button (right) for 3 seconds before turning off 6. When charging, the screen flashes with lightning symbols, and the digital battery level ranges from 0% to 100%. When fully charged at 100%, it stays on steadily 7. In standby mode, short press the battery button (left) to display the current battery level, and the screen will turn off after three seconds 8. When the heating function is turned on, briefly press the power button (left) to display the current battery level, and after three seconds, it will show the current temperature 9. During charging, the heating function cannot be turned on 10. When the power bank is connected, the screen displays the current battery level without turning off 11. When the hand warmer is turned on, the power bank automatically disables the hand warmer function when connected 12. When the battery level is below 5%, the lightning symbol on the screen flashes quickly, and after reaching 0%, the screen turns off Digital Tube Display Status: Charging mode Connect to the charger When charging, the digital tube flashes the percentage number, and it stays fully charged at 100%