Yep they connect like any other bluetooth headphones so you can play music from any source. There are three lights n the back, one to show if the transmitter is connected (happens instantly when you plug it into the bass, with no 'pop' noise or anything, same when you remove), one for battery charge and the other for bluetooth.
Using the app you connect the bluetooth audio as you would normally, then the transmitter connects as a sperate device through the app, but you only need to use the app if you want to change your saved preset which is saved to the headphones, and you can scroll through saved presets using the buttons on the headphones.