Unable to listen to my wireless

The first thing to do is to disconnect the Sennheiser wireless unit and try another headphone, preferably a cable type and see if both channels work. If the sound is OK on both channels, the fault is within the headphones. If you are lucky it will be the wireless unit plug or the cable and can easily be tested and repaired by somebody familiar with electronics. Otherwise you will probably need to have it repaired by a service shop or a technician. I hope the guarantee is stilll valid.

1. turn it off2. hold centre button until blinking blue and red3. briefly press volume down4. turn it off= fixed :)
From Sennheiser UK:http://www.sennheiser.co.uk/uk/home_en.nsf/root/contact_menu_technical-question_telephone_headsets_faqs_mm400_series_bluelight

Did you find a solution? I have the same problem!

Check out My tip on headphones, at the bottom of it you will find a link to a place that should have them. Just click my user name to find the tip.

Check the batteries in the head phones, check to see if they are switched to the samechannel that your transmitter is on. In many of the wireless headphones there are 3 or more channels that you can switch to in case your neighbor has the same unit.

I know this is a bit late but i had the same issues with my unit. turns out if you listen with the source volume really low the headphones cant detect sound so they shut off. you fix this by simply adding more volume from the source and then just decrease volume on the actual headphones to obtain desired listening level and say goodbye to this issue.

Try connecting them to an MP3 player or connect wired headphones to the same source to make sure the sound source is working correctly. If that works, verify the voltage on the batteries is 2.4 volts after charging. Mine stopped charging fully and the headphones wouldn't work at all, but when I connected a couple of AAA batteries to it in series, it worked great.

Hello,
Sennheiser sent me the manual.
Thank you, Eletta