Viivant USB LED Lamp for Portable Charger (white) Connect this lamp to any USB port for a bright but soft light Powered by a computer or laptop USB port, any power bank, portable charger or power pack or any USB wall chargers, no battery required Fantastic holiday gift or a perfect stocking stuffer great packaging and an awesome two year warranty offered upon product registration The soft light does not ever overheat, connected to a power bank, the charge offers 2.5 hours per 1,000 mash capacity Translation: 12.5 hours of light with our 5,000 mAh power bank