The Muddy 3-in-1 Rechargeable Hand Warmers provide convenience and function while out in the field. The primary hand warmer use provides up to 24 hours of heat. Four temperature settings allow users to adjust to what is most comfortable. A USB 2.0 power bank allows charging to portable devices. Included as well is a bright LED emergency flashlight. Muddy Hand warmers Up to 24 hours of heat 4 temperature settings USB power bank with USB 2.0 output to charge portable devices Bright LED emergency flashlight