Check the listing for details. ASR Outdoor Cold Weather 10 Hour Hand Warmer Pocket Camp Fire Survival Prepper. Color: White, Condition: New, Made in China. Listed at 9.99 USD. Stay warm and comfortable on your outdoor adventures with ASR Outdoor hand warmers. These air-activated warmers are perfect for keeping your hands toasty in cold weather without the need for external power or electricity. With a working temperature range of 124-155°F, these hand warmers provide just the right amount of warmth without getting too hot. They're also safe, odorless, and non-toxic, so you can use them without any worries. Each hand warmer lasts up to 10 hours, making them ideal for outdoor activities like hiking, camping, skiing, and more. They come in convenient pack sizes of 10, 25, 50, and 100, so you can choose the perfect amount for your needs. To use, simply open the package and expose the warmer to air.