【Ultra-Compact Design】The stylish card-style design easily fits into gloves, pockets, and purses for ultimate portability 【Long-Lasting Warmth】Provides up to 9 hours of continuous heating with three adjustable heat settings 【Magnetic Connection】Snap on. Connect and you're ready to go. The innovative magnetic design allows two units to snap together for easy storage and transportation 【Waterproof And Dustproof】IP35 rating ensures reliable performance in all weather conditions 【Wide Range of Uses】Perfect for commuting, outdoor activities, pain relief, and as a thoughtful gift 【Quality Assurance】They are made of higher quality materials and feature fine product craftsmanship. Better battery options ensure longer warmth and durability 【Simple But Not Simple Design】With bright colors, they add a touch of fashion to your warming kit. They fit perfectly into your daily life and complement your style while providing the warmth you need Specifications: Battery capacity: 2500mAh*2 Charging time: 3.5 hours Usage time: 4-8 hours*2 Input: Type C (5V 1A) Output: N/A Heat level: 3, 100°F - 108°F(35-42℃) / 109°F - 117°F(42-48℃) / 118°F - 125°F(48-52℃) Indicator light: Red/Blue