Zippo 2-Hour Silver Rechargeable Hand Warmer – Link

Amazon has this currently marked down to just $16.73

This was selling for $28.23 and is now its lowest ever on Amazon.

• Charges USB compatible devices including; mobile phones, Mp3 players, tablets, cameras, etc.
• Dual sided heat up to 113°F/45°C operating temperature with high and low settings for adjustable and comfortable warmth
• Battery and heat indicator lights
• Rechargeable 1900 mah Lithium polymer battery (included) for lasting reliable warmth – up to 2 hour Run time
• 1 year warranty