mophie is a California-based, award-winning designer and manufacturer of mobile intelligent devices and accessories. Widely acclaimed for innovative solutions, mophie is the proud developer of the juice pack, the first ever "Works With iPhone" portable battery case certified by Apple Inc. mophie products are recognized for style, engineered for performance and created to provide a seamless integration of industrial hardware, electronic software and artistic design. Get plenty of on-the-go power anytime with the lightweight, low profile mophie juice pack air made for iPhone 4s / 4. Adds up to 100% additional battery while its smooth finish and metallic outer band yield unmatched style and protection to complement your iPhone. Available now in black or Product Red.