* No Batteries are needed, use Solar Power.
* Noise-free: exclude Low frequency in some noisy conditions
* Continuous use : 200 hours, Depending on the volume level, the time is a little longer or shorter
* Rechargeable times: 500 times Max
* Hight efficient Hearing Aids.
* Saving energy and cost
* Adjusted volume to all conditions
* Adjustable tone and output sound control for personal use
* charged by solar power or AC adapter
*Standard Frequency : 1600Hz
* Max. Output Sound Level Gain : 40 + 5dB
* Highest Sound Pressure Level for Input SPL 90dB : 135 + 10dB below 145dB
* Equivalent Input Noise Level : Below 29dB
* Total Harmonic Distortion Value of Reality : 1600Hz: below 12%; 800Hz:below 16%; 500Hz:below 18%
* Battery Current : Below 10mA
* Battery Type / Life Expectancy : 1.2V / 1000 mA AAA size Ni-MH Rechargeable Battery x 2
* Operating Temperature / Humidity : +10oC - +40oC, 30% - 85% RH
* Storage Temperature / Humidity : -10oC to +60oC, 30% - 85% RH
* Size : 74(L)x53(W)x17.5(H) mm
*Weight : 36.6g
*Material : Hearing Aid: ABS, AC Adapter: ABS
