Hearing Aid Dr. Gray KF 909B

Specifications:
-Max Output: 126+-5dB.
-Max Gain: 55+-5dB.
-Total Harmonic Distortion: <6% (at 100Hz).
-Equivalent Input Noise: 28dB.
-Frequency Range: 300Hz-4000Hz.
-Voltage: 1.5V /1.3V.
-Current: <3.1mA /2.2mA.
-Zinc Battery.