Specifications: -100% brand new, high quality -Name: Hearing amplifiers with charging case -Material: ABS+silicone -Color:white+skin閿涘瘍hite閿涘異lack閿涘ed+blue -Power mode: rechargeable -Max sound out put:111+/- 5dB -Sound gain:>= 30dB+/- 5dB -Total harmonic wave distortion:<= 5% -Frequency range: F1≤200Hz, F2≥5000Hz -Input Noise:<=28dB -Voltage:d.c.1.5V -Current:<=1.2mA -Full charing in 2 3 hours, working more than 30 hours -The 300mAh recharging box for 3 times recharging to extend hearing amplifiers with 90 hours working. -The recharging box with power capacity LED display .
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