2 In 1 Retro Heater USB Charger Output Portable External Battery Hand Warmers 5000mAH Power Bank for Christmas Gift

Overview: Q1: Only one side or both sides? A1: Warm the whole hand. Q2: When will the hand warmer reach 52℃? A2: When the hand warming mode is turned on, the real-time temperature will be displayed, and then it will be heated to 52℃, which takes about 30s-1min, and then kept at 52℃. (If the room temperature is too low, the heating time will be longer, which is normal.) Q3: How long will the hand warmer heat up? A3: After fully charged, it can be kept at 20℃ for 3.5h to 4.5h. Question 4: Is it safe to use? A4: The chip automatically controls the temperature during charging, and the flame-retardant ABS material can also prevent high temperatures. Q5: How do you change the hand warmer and mobile power modes? A5: There are 2 buttons on it; press and hold the right button for 3 seconds, and it will start to display heat and digital temperature. Press the right button simultaneously for 3 seconds to turn off the heating mode. Press the left button to turn on the mobile power mode an