iPhone 6s is a smartphone designed and marketed by Apple Inc. released on September 25, 2015. It has a strengthened chasis and upgraded Apple A9 system-on-chip. It is water resistant and may survive speedy dunks. Compared to the iPhone 6, the 6s has an improved fingerprint recognition sensor, enables pressure-sensitive touch inputs and LTE advanced support. The iPhone 6s sold 13million units its first week on the market.