This hearing device can be used on either ear. It has a volume/tone adjustment to match the hearing amplification need. The receiver connection cable with one earphone, and attched with different size of earplug.
2 AA batteries included
Max. saturated sound pressure: 135dB±5dB
Full scale sound gain: ≥60dB
Harmonic distortion: When F<1000Hz, ≤ 15%; When F>1000Hz, ≤ 10%