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Since 1992, the Bumblebee radio coupling device has been manufactured by the Vladivostok plant Dalpribor. Bumblebee is a small-sized radio communication device designed for children 8 years old and older. The device provides wireless radio communication at a distance of 100 ... 120 meters in open areas. Power 9 volts from the battery "Krona". The frequency of reception or transmission of 27.14 MHz. The sensitivity of the receiver is 100 µV. Transmitter power 10 mW. With the help of the device "Bumblebee" it is possible to communicate both by telephone and telegraph.