For a mic like sennheiser ME66\K6 prof.mic.you have two options.
What might cause the blinking of the light,might be the battery,cause it functions in two ways,either by battery or by phantom power that needs to be activated by +48v power phantom on your mixer before it can work properly .
So you will do is either you get a replacement of the battery on get a mixer that has +48v power phantom power.
Answers & Comments
For a mic like sennheiser ME66\K6 prof.mic.you have two options.
What might cause the blinking of the light,might be the battery,cause it functions in two ways,either by battery or by phantom power that needs to be activated by +48v power phantom on your mixer before it can work properly .
So you will do is either you get a replacement of the battery on get a mixer that has +48v power phantom power.