Get faster, more efficient charging on the go with the EFM?? 5000mAh POWER BANK with Device Sensing Technology (DST) and the latest in slimline lithium-polymer battery technology. This power bank allows you to charge a device via the USB port, making it perfect for work or travel, or when you on the go without access to a power supply. The EFM?? 5000mAh POWER BANK comes pre-charged and ready for use anytime anywhere for your convenience. The clever technology also stops the battery from overcharging, prolonging the life of the battery and the device itself, comes with 2.1A output for faster and more powerful charge. This Power Bank is universal, portable and a rechargeable power source designed for any electronic devices and conveniently includes 1 x 25cm Micro USB cable.