control, and all the expected power features. The RDX 7-speaker audio system features XM Satellite Radio, along with an in-dash 6-CD changer, which is capable of playing standard Audio CDs, and Data-CDs burned with either MP3 or WMA files, it also plays DVD-A type CDs. Much of the interior technology originally introduced in the RL sedan was equipped in the optional "Technology Package". This package included Acura's navigation system, a backup camera, XM Nav-Traffic real-time traffic monitoring, and Zagat restaurant reviews. The package also featured a 10-speaker ELS Surround audio system with DTS and Dolby Pro Logic II surround sound. Both stereos included a 1/8" (a 3.5mm) auxiliary input jack used to plug in external sources such as iPods. For 2007, Acura also offered an iPod adapter for the RDX, which was wired into the glove box, and allowed the iPod to be controlled through the RDX's sound system interface. Due to hardware incompatibilities, the Honda/Acura iPod music link was discontinued for the 2008 model year. The 2010-12 models featured a USB connection that interfaces with iPods and other USB mass storage devices, such as flash drives that contain MP3, WMA6, or AAC music files while being stored in the center console. Safety The first-generation RDX was the second Acura vehicle to feature the Advanced Compatibility Engineering (ACE) body structure, which is designed to absorb energy from a collision. Standard safety features include six airbags, including dual front airbags, front side airbags, and dual-side curtain airbags. The front airbags use a dual-threshold, dual-stage technology that can adjust the timing and speed of each airbag deployment depending on the degree of impact and the driver's or front passenger's seat belt usage. If sensors deem the front passenger is too small (less than ), the front airbag is designed not to deploy. The front passenger's side airbag is also designed to shut off if a child or small-statured adult is leaning into the airbag's deployment path. In the event of a sufficient side impact or roll-over, the side curtain airbag deploys from above the door frames of the affected side, with coverage for both the front and rear occupants on that side, and stays inflated longer than if there were a collision. Front seats feature active head restraints and their seat belts are equipped with pre-tensioners and force limiters. In November 2006, the RDX was crash-tested by the U.S. National Highway Traffic