The Handi Warmer has 3-5 hours of heating time w/ dual sides. Heats up in only 6 seconds. Hand warmer temperature is 100 to 125 degrees Fahrenheit. Low temp is 100 degrees for 5 hours and Hi temp is 125 degrees for 3 hours. Average charging time is 3 hours. On-off button control. Includes USB cable, convenient wrist strap, waterproof carrying bag and 4 language instruction manual. 2 functions: Hand warmer and power bank. Charge your phone, camera and other USB powered devices. Protection: Short circuit, overcharge and over discharge. PERFECT FOR OUTDOOR OR INDOOR ACTIVITIES. Use the various functions for hunting, camping, hiking, skiing, fishing, commuting to work, computer users and more. The hand warmer provides heat support for those suffering from cold hands or poor circulation due to weather or conditions such as Arthritis, Raynaud's, Lupus, Scleroderma, or Myalgia.