| Global parameters | Inspiration | Harmony | Comfort | Digital |
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| Adjustable pitch | Yes | Yes | Yes | Selectable |
| Adjustable volume | Yes | Yes | Yes | Selectable |
| Pitch range total | 70- 195 Hz | 75-165 Hz | 75-165 Hz | 80, 93, 110, 130, 155 Hz |
| Base pitch range | 70-121 Hz | - | - | - |
| Dynamic pitch range | 45-70 Hz | - | - | - |
| Volume range | 60-83 dB | 68- 85 DB | 68- 85 DB | 70, 76, 83 dB |
| Dynamic Volume range | base + 0..11 dB | - | - | - |
| Speech time per charge | 24-30 h* | 30-40 h* | 4 h* | 4 h* |
| Full charge time | 4 h w Labex charger | 6 h | 6 h | 6 h |
| Mechanical buttons | No | 3 | 3 | 2 |
| Touch button/slider | 1 | - | - | - |
| USB charge | Yes | Yes | - | - |
| Speech buttons | - | 2 | 2 | 1 |
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* depending on pitch and volume selected
| Physical parameters | Inspiration | Harmony | Comfort | Digital |
| Diam x Length | F32 x 123 mm | F32 x 123 mm | F34 x 98 mm | F34 x 98 mm |
| Weight | 168 g wth battery | 168 g wth battery | 72 g w/o battery | 72 g w/o battery |
| Body material | ABS + Aluminium or Stainless | ABS + Aluminium or Stainless | ABS | ABS |
| Dust resistance | Yes | Yes | Yes | Yes |
| Moisture resistance | No | No | Yes | Yes |
| Standart covered | IP43 | IP43 | IP54 | IP55 |
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| Features | Inspiration | Harmony | Comfort | Digital |
| Low battery warning | Yes | Yes, 3 levels | Yes, 2 levels | Yes, 2 levels |
| Check discharge level | Yes | Yes | - | - |
| Charge finished notification | Yes | Yes | Yes | Yes |
| Lanyard holder | Yes | Yes | Yes | Yes |
| Lanyard | Yes | Yes | Yes | Yes |
| Power charger | Built-in | Built-in | - | - |
| Charger station | In the box | In the box | 2 slots | 2 slots |
| USB cable | In the box | In the box | - | - |
| Connector type | USB type A to microB | USB type A to microB | - | - |
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| Battery info | Inspiration | Harmony | Comfort | Digital |
| Battery Capacity | 3,7V 3300 mAh | 3,7V 3300 mAh | 2 x 9V 600 mAh | 2 x 9V 600 mAh |
| Battery type | Li-Ion, permanent | Li-Ion, permanent | Li-Ion, exchangeble | Li-Ion, exchangeble |
| Rechargable battery | | Yes | Yes | Yes |
| Charge current | 0,5 A; 1,0 A; 1,5 A - depending on USB port power | 0,5 A; 1,0 A; 1,5 A - depending on USB port power | | |
| Battery manufacturer | Panasonic | Panasonic | EBL, Taiwan | EBL, Taiwan |
| Battery recharge lifecycles | > 500 | > 500 | > 400 | > 400 |
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| Warranty conitions | Inspiration | Harmony | Comfort | Digital |
| | 2 years | 2 years | 2 years ** | 2 years ** |
| post-warranty repairs | In the factory, autorized local centers | In the factory, autorized local centers | In the factory, autorized local centers | In the factory, autorized local centers |
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** for the unit only, does not cover batteies and chargers