OCOOPA Rechargeable Hand Warmer | GearJunkie

Specifications

Max temperature: 110 deg. F average; 131 deg. F maximum
Heat/Run time: 4-8 hrs.
Charge time: 2-3 hrs.
Weight: 4.6 oz.

Pros

Rechargeable
Can charge other devices
Easy to use

Cons

Doesn’t hold a charge as long in extremely cold temperatures