Слуховых аппарат для глухих с регулятором громкости

2 Behind the Ear Sound Amplifier Deaf Hearing Aid with Volume Control function , Work with L1154 battery (HAP-20)
This Product is a sound amplifier, which can catch faint voice from the outside world and get a higher voice witin 10 meteres.
1) Maximum sound output (+/- 5 dB) :130
2) Maximum acoustic gain (+/- 5dB) = 50
3) Total Harmonic Wave distortion = 5%
4) Frequency response Range (Hz): 300 - 4000
5) Input Noise (dB) = 30
6) Power Voltage (V): 1.5
7) Current (mA) = 4
8) Battery Type : L1154 1.5V batteries
9) Included:

Elegant case
3 x earplugs
3 x L1154 batteries
1 x Instruction manual (English)
Type of Packing: Color Box