need advantages of head movement based voice enabled wireless switching device for physically challenged and need full details about this topic

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i want advantages and disadvantages,applications for head and Tongue Movement based and Voice enabled wireless Device Switching for basic needs of Physically Challenged Persons

please can you send me the advantages , disadvantages, and applications of head movement based voice enabled wireless switching device for physically challenged. here it is my mail reddymounika534[at]gmail.com.

need advantages of head movement based voice enabled wireless switching device for physically challenged and need full details about this topic