Compact in design with your choice of other available models and power to suit your needs, Nextek Energy provides a compact, sleek and modern style charging unit. The Pocket boost 4200 which comes in a choice of 5 Brilliant and business like toned colors will most certainly handle your devices power needs and then some. I personally have had the pleasure of testing one of these out first hand and can tell you that I will NEVER go without one. During the time of testing, we here in New Brunswick suffered an ice storm in which the power was off in some areas for days. Luckily, thinking ahead I had the notion to charge this tiny wonder in and have it ready. As modern as we are, during a power outage portable phones do not work. Out comes the cellular device, but their battery life is just not the same. This is especially true for the smart phones with all the battery draining options they have.