behringer ultralink ulm200m


my cordless  behringer microphone is connected to my behringer QX1204USB mixer.  The light on the microphone and the USB device connected to the mixer is blinking orange 4-5 seconds than turns off.  How do I get the light to stay on and work so sound comes out of my speakers.  I get sound coming out of my speakers when I use my wire microphones but not with my cordless microphones.