Stay entertained on the go using this Audiovox IPDUNVBT mount system, which lets you easily mount a tablet to your vehicle's post-mounted headrest. The 100-channel FM transmitter lets you listen to music via speakers or the included Bluetooth headset.
I believe it is discontinued, but this mount fit perfectly on our Outback to hold an iPad Mini. It has kept our 4yo entertained for many five hour trips and helped the adults retain their sanity.