Celestron Elements 2-in-1 Hand Warmer and Charger, ThermoCharge 10, Blue (48024) 2-in-1 Outdoor tool: Hand warmer and Power bank Ergonomic aluminum body with Power Curve design enhances heat transfer 10000 mAh battery provides up to 12 hours- a full day- of heat Charges smartphones and tablets, sports cameras, GPS devices, MP3 players and more IP65 rated water resistant and dust proof and drop tested tough- ready for any excursion C-link feature allows to connect o other Celestron power banks for extended heat times- up to 30 hours Auto charge feature means no buttons to push- simply plug your device into the USB OUT port to begin charging