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According to ANSI Standard S3.22 1987
Maximum SSPL90: 125 dB
HFA-SSPL90: 119 dB
HFA-full-on Gain: 46 dB
Reference Test Gain: 42 dB
Frequency Range: 200 Hz to 6000 Hz
Equivalent Input Noise: 27 dB
Total Harmonic Distortion: 800 Hz: 8%, 1600 Hz: 2%
Range of Volume Control: 40 dB
Input Switch: O-M (HB-23P)
Battery Type, Current, Life: 13, 1.3 mA, approx. 177 h
Receiver, Microphone: Magnetic, Electret Condenser
Dimensions: 3.6 × 1.3 × 0.88 cm
Weight: 4.2 g (excluding battery)
Contents: Main unit, earphone ear hook, battery
