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| Technology related WHO criteria | Commercial-ready version |
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| BTE is preferred but body worn type may also be needed for low cost, ease of use, and availability of batteries, also in cases of rural areas where body worn is preferred | Body worn designed for rural usage |
| Allowing ease of service, components available for five years; manufacturer provides sufficient detail | Yes |
| HA should be powered by zinc air or secondary rechargeable cells; rechargeable types are preferred | Rechargeable |
| Operating in temperature 5–45 degree range, humidity 0–80% | Yes according to part datasheets |
| Having means to reduce gain below 750 Hz | Yes (low freq cutoff 380 Hz) |
| Allowing at least 12 dB reduction at 250 Hz relative to 750 Hz | Yes |
| Gain can be preset or adjusted by user | Programmable via computer |
| At least 30 dB volume range, volume control clearly numbered | Yes |
| Induction coil is an option but preferred | Induction coil provided |
| HA with AGC is preferred | AGC with WDRC |
| Manufacturer has ISO 9001 on quality management system | ISO 13485 (medical product QS) |
| HA should be designed such that risk of injury or discomfort to user is minimized | Yes |
| Manufacture should provide HA with at least few basic colors | Yes |
| The number of moving parts should be minimal | Yes |
| DAI, FM, or other direct coupling input could be considered for educational settings but should not be considered priority if jeopardizes the provision of hearing aids themselves | with Bluetooth input (option) |
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