THE S60 has a digital network-based Multiplex electrical system which, among other things, allows the owner to specify such items as an integrated telephone. Stability and traction control systems are also available - STC (2.4T) or DSTC (standard on T5 only). STC automatically can reduce engine torque (shutting down either one cylinder or two) to the driving wheels to maintain as much grip as possible at any given moment, while DSTC uses a gyro sensor and steering movement sensors to determine whether the vehicle is losing any grip, applying either brakes or engine torque to maintain control.