The ZAGGsparq is the most convenient and stylish portable backup battery available. Built-in prongs allow the ZAGGsparq to double as a wall charger, and eliminates the need for an extra power adapter to keep your digital life running. The ZAGGsparq provides between 1 and 4 charges for a typical handheld device, and ZAGG's Hypercharge Technology on select ZAGGsparq models provides 2.1A output for ultra-fast charging, up to four times faster than a standard USB charger. An attractive, durable polycarbonate shell design allows the ZAGGsparq to maintain a glossy outer finish without gathering fingerprints or scratches. The soft-touch rubber underside allows the charger to fit comfortably in your hand. The ZAGGsparq features five LED lights to indicate power and charging levels, and a convenient on/off switch helps prevent battery drainage. Note: Some USB-charged devices use proprietary charging specifications. The ZAGGsparq has been designed to charge iOS devices and most Android smartphones and tablets. The ZAGGsparq is not compatible with the Nexus 7 tablet.