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The electronic hearing aid "Electronics U-2M1" or U-2M4 has been produced since 1990. The device is designed to compensate for weak and moderate hearing loss. Acoustic amplification apparatus "Electronics U-2M1" - 50 dB, "Electronics U-2M4" - 40 dB. Sound pressure level 90 and 86 dB. The range of working sound frequencies is 300 ... 3000 Hz. Supply voltage 1.2 V. The duration of continuous operation is about 20 hours.