Technical devices for fixing conversations?

Question

Iron

It is required to install a voice recorder / bug in the room for long-term recording (within a month).
Requirements: autonomous power supply (from 30 days should be enough)
Sufficient HDD or recording only when noise / voices appear in the room.
Someone will tell you which way to look, what class of equipment, what companies to look at?

Answer 1

Criminal Code
Article 138.1. Illegal circulation of special technical means intended for secretly obtaining information
is punishable by a fine in the amount of up to 200 thousand rubles, or in the amount of the wage or salary, or any other income of the convicted person for a period of up to 18 months, or by restraint of liberty for a term of up to four years, or by compulsory labor for a term of up to four years. years with deprivation of the right to hold certain positions or engage in certain activities for up to three years or without it, or imprisonment for a term of up to four years with deprivation of the right to hold certain positions or engage in certain activities for a term of up to three years or without it.
Illegal production, acquisition and (or) sale of special technical means intended for secret obtaining of information -