used: the insufficiency In patients with hearing loss the hearing compensation function: suitable for the loss of hearing Material: ABS the Normal Operation: Room temperature 5? ~ 40? The relative humidity? 80% 86kPa air pressure ~ 106kPa 1.4V supply voltage of.c.,with a failure is relatively +5%, -10%. aid auditory appearance should be properly color must be uniform the surface does not have to be Burr, Flash, depression, the scratches and other defects. orientation and direction of the change of the volume should be expressed in words or the quantities, the polarity of the battery must be marked accordingly. auditory aid must be fully assembled parts, solid and reliable, the knob settings on the switch should be flexible and efficient.
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