â  Analogue BTE, economic item
â  Volume control
â  On/off switch
Max Sound Output:         130dB ±5dB
Max Sound Gain:           50dB ± 5dB
Harmonic Wave Distortion:      â¤5%
Frequency Range:Â Â Â Â Â Â Â Â Â Â 300~4000Hz
Input Noise:               â¤30 dB
Battery:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â AG13Â Â
Working Voltage             c1.5VÂ
Working Current:            â¤4mA   Â