The Hand Warmers Rechargeable 2 Pack by AOY-766 are compact and portable electric hand warmers with a size of 1.97x3.39". They have a rechargeable lithium-ion battery with a 3-hour charging time and provide a temperature range of 95 to 131 degrees Fahrenheit. These hand warmers feature AI temperature control, making them ideal for outdoor use in cold weather. The package includes two hand warmers, a charging line, and are backed by a 5-year warranty. Perfect for both men and women, these hand warmers are a convenient and efficient way to keep your hands warm during winter activities.