Features:
Model:F-137 BTE Hearing Aid
Max Sound Output: 127dB ± 4dB
Max Sound Gain: 48dB ± 5dB
Total Harmonic Distortion: 4%
Frequency Range: 450~3500 hz
Equiv Input Noise: 30 dB
Battery: AG5 Button Battery or A13 (Zinc Air Battery)
Working Voltage: D. C. 1.5V
Working Current: 3mA
Measurement: 4.6*3.8*0.9 cm
Packaging: Gift color box
Color Box Size: 8.7*9.6*3.5cm
GW per Box: 0.1kgs

Package included:
1 x hearing aid amplifier
4 x earplug (different size)
2 x AG5 button cell battery
1 x manual
1 x case