Bluetooth Headset with strong interference/noise

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Hello,

I have here a Plantronics Pulsar 590A Headset and became it gladly for Telefonie at the computer, with the fixed net telephone, as cordless headphones for the Ipod, etc. use.
In principle the equipment fulfills all requirements.

I bought the headphones over Ebay and state now that there are intolerable background noises, if I connect him by Bluetooth with provided 3.5 " handle adapters. It rushes & beeps permanently.

According to Plantronics noise can be caused by fluorescent tubes (I have here), contact strips, Handies, screens and still zig different devices.

Does one have to compensate with this noise, or does point themselves that your opinion after on a defect? Do you know ways to reduce the noise?

If someone else suggestions and recommendations for a Headset with above mentioned. Requirement profile has, then I would be pleased much about it. Are 2.4 Ghz radio more insensitive than Bluetooth?

Greet Jens