all models, sweeping into the front fenders, while the Tahoe, Suburban LTZ, Yukon, and Yukon XL Denali trims feature projector-beam high-intensity discharge headlamps and light-emitting diode daytime running lamps. The Yukon and Yukon XL also feature projector-beam halogen headlamps on all SLE and SLT trims. The improved safety features included a 360-degree radar detection for crash avoidance and occupant protection and a high-tech anti-theft system that now includes vertical and interior sensors, in-glass and window breaking, a triggering alarm, and a shutdown device that prevents the vehicle from moving. The latter is expected to address the issues regarding the constant thefts of the vehicles, especially with the previous generation's removable seats and items left in the cargo space, which has become a target for carjackers who see the third-row seats as valuable on the black market. According to General Motors' head of Global Vehicle Security Bill Biondo, "We have engineered a layered approach to vehicle security," adding that "With new standard features and the available theft protection package, we are making the vehicles less attractive target to thieves and more secure for our customers." Also new are the addition of fold-flat second and third-row seats (replacing the aforementioned removable third seats), which is now a standard feature but can be equipped with an optional power-folding feature for the upgraded trims, and an additional two inches of legroom for second-row passengers. HD radio became a standard feature on all trims. Multiple USB ports and power outlets are now spread throughout their interiors, including one 120V three-prong outlet on both Suburban and Yukon XL, with the Suburban adding an available eight-inch color touch screen radio with next-generation MyLink connectivity along with an available rear-seat entertainment system with dual screens and Blu-ray DVD player, while the Yukon XL adds a standard eight-inch-diagonal color touch screen radio with enhanced IntelliLink and available navigation. A 4G LTE WiFi access system, along with Siri Eyes Free and text messaging alerts, was included in all vehicles that feature the OnStar device around the second quarter of 2014. 2015 mid-year update The Suburban added a hands-free power liftgate feature that is standard on the LTZ but included on the LT with the optional Luxury Package. The added 4G LTE WiFi and Siri features became standard on both LT and LTZ trims, while the MyLink with Navigation feature was upgraded from optional to standard on the LTZ trim. The