twoway communication spy audio device (Индия - Тендер #38570609)

I need a spy gsm device in two way communication which is small and good in size and not too big, calls through mobile network, which cannot be detected by metal detectors, the earpiece of the device which is placed in the ear, which has a capacity of at least three It should be up to meter so that the sound can be heard clearly and the battery backup is also fourIt is necessary to be from five hours.If this is not available with you then you tell me how much investment I have to make this thing I need at least 250 pieces

Country: India

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