This 4,000 mAh black premium rubber finish portable charger is an ultra slim power bank with multiple safety system & unrivaled quality. This extremely portable lightweight power bank will easily fit into a pocket unnoticed and it comes in black, makes it the perfect smartphone companion. Made with a soft black rubber coating, it is ideal for to be silk-screened or even full color digitally imprinted (additional cost). It will help boost your brand with its advanced technology and superior safety features. It comes with a power button, Micro USB input, an USB output, and a modern looking LED indicator status. It is CE, FCC and ROHS certified besides the cell battery being UL certified. It comes in a nicely designed retail packaging. Your clients will love using this high end accessory.