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Since 1991, the Beleng-100 radio intercom has produced the Leninogorsk Instrument Plant. The device is intended for children from 8 years and allows for two-way communication at a distance of up to 100 m. The sensitivity of the receiver is 150 µV. Transmitter power 10 mW. The frequency is 27.14 MHz. Powered by 4 AA batteries. Dimensions RS 61x183x48 mm. Weight 400 gr.