Door bell

I bought the doorbell several months ago, I was unable to install it until now.  When I opened the box and saw the micro-usb on the back I plugged it into computer too charge.  The white light was flashing.  In the meantime, I got the wires ready, made sure I had voltage on the faceplate then slid doorbell into place.  No response.  Tried pushing both reset buttons on the back and no response.  Put it back onto the micro-usb and still no response.  Any ideas on the problem here?