Some of the standard features include the very important rearview camera, cruise control, front and rear head airbags, stability control, traction control, and rear door child safety locks. (jeepcheap.com)
If you have fancier knobs you can get door child safety locks specifically designed for the kind you have. (childproofingtips.com)
For children's safety, the A4 provides rear door child safety locks and Lower Anchors and Tethers for Children (LATCH) in rear seats. (automotive.com)