The HeatBank 9 Hour rechargeable hand warmer keeps you warm and also functions as a power bank to keep your devices charged. Dual sided heating, with 6 different settings. Rechargeable 5200 mah lithium-ion battery, with up to 9 hours of run time per charge when using the lowest heat setting. Charges USB compatible devices including; mobile phones, Mp3 players, tablets, cameras, etc. Dual sided heat up to 120°F / 50°C with Six heat settings for adjustable warmth. Rechargeable 5200 MaH lithium-ion battery with an up to 9 hour run time when using the lowest heat setting. UL Certified.