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Do you mean it "can" or can't connect to your CU920?
If your CU920 is already paired to a computer or other device this first pairing must be stopped before the steps below will work.
On the Bluetooth headset:
1. Turn your headset ON.
2. Hold down the headset power button until the power indicator light blinks an alternating red & blue.
Then using your CU920....
3. Turn Bluetooth ON,
4. Search "New Device,"
5. Under "devices found" select your headset.
6. Select "Add." The CU920 will ask for a passcode.
7. Enter "0000" (four zeros) the default for the Explorer 220.
The Plantronics earpiece should automatically "pair" with your CU920.
Hey, I have managed to turn off blinking in My Plantronics 665 by first: Turning off headset, then pressing volume up and turning it on. It will blink to show that it is on, , then blink one more time to show, that it is connecting to phone, and thats it, : no more blinks, So You don't look like UFO :-) Cheers from PL.!
Try going through the plantronics website for a replacement. My 590's date code was within warranty and I ended up replacing it TWICE. The one I have now has a different date code and seems to work fine now.
I surmise that the charging problem may have to do with bad voltage regulation and extreme sensitivity in their electronics.