3-Second Quick Heat: Extremus OPALM hand warmer is developed to fulfill the needs of outdoor enthusiasts and avid travelers. The fast-heating feature offers instant relief in just 3 seconds. This design also provides heat therapy for individuals suffering from Arthritis and Reynaud?s.. Thoughtful and Practical Warm Gift: Winter is the season to give meaningful gifts to your loved ones. Built-to-last battery hand warmers will bring your love and warmth to their fingertips, even in the most frigid conditions.. Innovative Temperature Adjustment: The world?s first push-pull gear mode allows you to adjust the settings of rechargeable heater without looking at the indicator light, so your hand can adjust the temperature from the warmth of your pocket. The hand heater?s three settings are 95-107.5F/35-42C (low), 107.5-118.5F/42-48C (medium), and 118.5 - 130F/48-55C (high). Buy with confidence. Check out our reviews. Also, happy to combine shipping to save you when you buy multiple items.