the flashing lights of a police car. The light bar is also used in conjunction with the PlayStation Camera to judge the positions and movements of multiple players. The controller features several input and output connectors: a stereo headset jack (3.5 mm CTIA TRRS connector), a micro-USB port, and an extension port. It can be charged using the console, using a dedicated charging station, or via microUSB using a standalone charger. It also includes a mono speaker, like the Wii Remote, and is the second major controller in video game history to have such feature. The DualShock 4 features the following buttons: PS button, SHARE button, OPTIONS button, directional buttons, action buttons (triangle, circle, cross, square), shoulder buttons (R1/L1), triggers (R2/L2), analog stick click buttons (L3/R3), and a touch pad click button. These mark several changes from the DualShock 3 and other previous PlayStation controllers. The START and SELECT buttons have been merged into a single OPTIONS button. A dedicated SHARE button allows players to upload screenshots and videos from their gameplay experiences. The joysticks and triggers have been redesigned based on developer input, with the ridged surface of the joysticks now featuring an outer ring surrounding the convex dome caps. The DualShock 4's buttons differ slightly in functionality from the DualShock 3. Only the L2 and R2 triggers are pressure-sensitive, a change from the functionality of the DualShock 2 and 3. This is likely due to the fact that most games did not utilize these buttons as well as due to it not being used on competitors' controllers. The PlayStation 3 is forward compatible with the DualShock 4 (originally only via a microUSB cable). Firmware update 4.60 for the PS3 added wireless connectivity; however, motion and vibration functions are not supported. As the START and SELECT buttons are no longer present, the OPTIONS and SHARE buttons respectively replace them. The PS button does not work, thus requiring the console to be reset in order to go back to the menu. Version issues and modifications Sony's earlier DualShock 4 controllers (CUH-ZCT1 controllers) had wear issues with the rubber surface on both analog sticks which exhibited excessive wear or tearing after short-term use. In January 2014, Sony issued a statement acknowledging an issue on 10% of controllers. In early September 2016, Sony confirmed a second version of DualShock 4 controllers, known as the DualShock Version 2 (CUH-ZCT2), which hosts slight improvements