Features:

* Deft miniature hearing aid with low distortion, noise.

* Volume can be adjusted to all condition  

* 3 size of ear pieces + 1 cleaning brush.

* Fancy pocket carry box with Auto-shut-off function when close, in case of forgetting to turn off the power.

* Battery: 2 x PR41 ( button size ).

* Total Harmonic distortion valuse of easily: 2500Hz: below 3%  / 800Hz:  below 4% / 500Hz:  below 4%.

* To prevent from children swallowing, battery cover should be torn  down  with tool.  

* Standard Frequency : 2500Hz

* Out Volume : 25~35dB

* Sound Pressure Level : 104~113dB (below 117 dB)  

* Input Interference level :  Below 29dB

* Battery current : Below 0.8mA

* Battery life: 260 Hours

* Weight: 2.2g

* Operation Temperature : 10℃~40℃