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Hi Ron. The question is, why is the wheelchair generating sufficient electromagnetic noise to affect the microphone system? Have you tried other wheelchairs near the microphone? Does it still cause interference when the chair is "off"? I did once come across a powered wheelchair that continued to emit quite a lot of electrical noise even though it was switched off. Is it definitely the microphone or is it the computer it is plugged into - ie do you still get audio interference from the sound card speakers without the microphone plugged in? Sorry, lots of questions, not many answers. Geoff Harbach LEPMIS In a message dated 22/11/2006 17:58:01 GMT Standard Time, [log in to unmask] writes: Hi, I wonder if anyone has any experience of this and can suggest an alternative. As recommended by a DSA assessor we’ve supplied a copy of Dragon Naturally Speaking voice dictation software and a Plantronics USB headset to a student who is an electric wheelchair user. She is having great difficulty in training Dragon to recognise her voice as there is a lot of interference, presumably from the wheelchair’s motors, being picked up by the microphone. We’ve checked the microphone in a room away from the wheelchair and there is no interference there. I guess we need to go for a different headset, but has anyone any experience or knowledge of what type of microphone might work without being susceptible to the interference? Thanks in anticipation. Ron Milner MKC Computers Ltd _____________ NOD32 EMON 1877 (20061122) information _____________ This message was checked by NOD32 antivirus system _http://www.eset.com_ (http://www.eset.com/)