Tested and working. Compatible with car stereos, cell phones, smartphones, stereos, iPods, tablets, and TVs. This device connects to AUX and receives music via Bluetooth from a smartphone. Purchased and used for about an hour to listen to music from a cell phone in a car stereo. Selling because the media player has been repaired and is no longer needed. Please understand that this is a used item. Shipped via Nekopos.