Kesguar Store via Amazon has 2-Pack Kesguar Rechargeable Magnetic Hand Warmers with 10000mAh Charging Case on sale for $29.99 - $2.10 off when you clip the coupon on the product page - $15 when you or apply code RKRDOMG2 at checkout = $12.89. Shipping is free w/ Prime or on orders $35+.

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Thanks to Deal Hunter Navy-Wife for finding this deal.

Features:

• Kesguar hand warmers rechargeable features 2x2000mAh hand warmers + 1x10000mAh charging case innovative design.allowing you to quickly recharge your hand warmers on the go. Get 3 hours per warmer charge and up to 4.5-10 hours of continuous warmth, eliminating battery anxiety on outdoor activities like golfing, hiking, hunting, etc.
• 1s Instant Heat & 3 Heat Settings: Experience warmth in just 1 second with these 2-pack rechargeable hand warmer of single side! Choose from 1st level (35℃/95℉-42℃/107.6℉), 2nd level (42℃/107.6℉-48℃/118.4℉), and 3rd level (48℃/118.4℉-55℃/131℉) banish the chill or soothe sore hands, keeping your hands cozy and comfortable.