JIJ US via Amazon [amazon.com] has for Prime Members: 2-Pack JIJ 4000mAh Magnetic Rechargeable Hand Warmers (Black) on sale for $19.99 - 50% off when you apply promo code QR4U559B at checkout = $9.99. Shipping is free.

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Includes:

• 2x Rechargeable Hand Warmer
• Charging Cable
• Storage Pouch
• User Manual