The Reciver runs at about 2W, so no appreciable current. Especially since the Reciver includes a small LiPo, the buffers again.
The Reciver is from August (MR230B) and is very well suited for mobile audio applications.
What would be an idea, a USB port is (also works with 5V) for mobile phone shop to hang drann, no problem is likely to represent.
All in all, I recommend this for small currents without restrictions.