| HA-9816 for Medium to Serious Deafness A、 Max. sound output:128dB±5dB B、 Max. sound gain:56dB±5dBC、 Harmonic distortion:≤ 5%（1600Hz）D、 Equivalent input noise:≤33dBE、 Frequency range:250-4500Hz F、 Battery voltage: AA\1.5V G、 Vol：6.9*4.5*2.1cmNovel design, small size, pleasant appearance, multiple functions and best performanceGA control, PC control and AV indicator lightHA-9812A、Max. sound output: 126dB±5dBB、Max. sound gain: 50dB±5dBC、Harmonic distortion:≤ 6%（1600Hz）D、Equivalent input noise:≤33dBE、Frequency range: 250-4500HzF、Battery voltage: AAA\1.5V |