Specification:
• AC-DC-AC frequency conversion technology
• Digital wave synthesis, wave feed-back technology, low power distortion
• Controlled and tested by 16 bits MCU, which has high automation
• High speed 12 bits A/D sampling technology, exactly display Voltage, Current, Power,

Digital hearing aid 438 (new)
Full digital circuitry
Air conduction
Feedback reduction
Micro BTE design
Left & right ear adjustability
Digital volume control
High & low tone control
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Digital hearing aid 838
Specification:
Digital circuitry
Mini BTE design
Air conduction
Left and right ear adjustability
Digital Volume control
High or low tone control
Product size: 55x35x10mm
Weight: 4 g
Max. saturation sound pressure level(SSPL): 130dB±4dB
Full on Acoustic Gain:

Digital hearing aid 638
Specification:
Digital circuitry
Mini BTE design
Left or right ear adjustable
Detachable receiver
Digital Volume control
High or low tone control
Product size: 55x35x10mm
Weight: 7g
Testing Item Indicator
Max. saturation sound pressure level 130dB±4dB
Rated

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