From Brookstone, this hand warmer features: Hands stay toasty with this lightweight warmer that's smooth-to-the-touch and fits perfectly in the palm of your  hand Has three temperature ranges that are easy to set  Indicator lights that show battery and heating status Keep it in your pockets for ice fishing, watching outdoor sports, and skiing trips Overcharging protection Short-circuit protection Overheat protection Heats up in seconds Heating status and battery indicator lights Includes: (1) hand warmer (2) 18650 rechargeable lithium batteries USB charging cable included One size Imported.