Ultra-Compact Design: Sleek card-style design fits easily in gloves, pockets, and wallets for ultimate portability. Long-Lasting Warmth: Provides up to 9 hours of continuous heat with three adjustable heat settings. Magnetic Attachment: Snap. Attach and Go. Innovative magnetic design allows two units to snap together for easy storage and transport. Waterproof and Dustproof: IP35 rating ensures reliable performance in all weather conditions. Versatile Use: Perfect for commuting, outdoor activities, pain relief, and as a thoughtful gift. Quality assurance: Produced by Ocoopa, a trusted brand chosen by millions of users, these hand warmers are UL certified. They are made from better quality materials and have detailed product craftsmanship. A better battery selection ensures longer warmth and durability. Passionate about customer satisfaction, Ocoopa offers an unconditional 2-year after-sales guarantee. Simple but not simplistic design: come in vibrant colors, adding a touch of style to your warming kit. They perfectly match your daily life, complementing your style while giving you the warmth you need.