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Table 1 Comparison characteristics of the hearing aids

From: Effectiveness of a programable body-worn digital hearing aid for older adults in a developing country: a randomized controlled trial with a cross-over design

Characteristics P02 Concerto basic Clip-II™
Gain adjustable by pre-set options or user controls Programmable Screw trimmer Screw trimmer
Electroacoustic specification (IEC118–7 2 cc. Coupler) Digital Digital Digital
Maximum output (OSPL90) 118 ± 4 dBSPL 123 dB SPL 129 dB SPL 129 dB SPL
Maximum output at 1 KHz (OSPL90) 114 ± 4 dB 117 dB SPL 121 dB SPL 121 dB SPL
Maximum FOG (45–55 dB + 5 dB) 66 dB SPL 67 dB SPL 67 dB SPL
Maximum FOG at 1 KHz (42 + 5 dB) 63 dB SPL 64 dB SPL 64 dB SPL
Basic frequency range 200–4500 Hz 573–4400 Hz 100–3990 Hz 130–3690 Hz
Total dynamic distortion 500 Hz < 5% 0.6% 2.6% NA
Total dynamic distortion 800 Hz < 5% 3.8% 2.1% 2.1%
Total dynamic distortion 1600 Hz < 2% 0.4% 0.1% 0.1%
Equivalent input noise level < 25 dB SPL 31.4 dB SPL 24 dB SPL 24 dB SPL
Powered by zinc-air or rechargeable Rechargeable Lithium-ion Zinc-air models Zinc-air models
Battery current 11.8 mA 0.65 mA 0.65 mA
Maintenance Charged by electricity for 3 h every 3–4 days Changing the battery every month Changing the battery every month
Price Estimated 100 USD 300 USD 300 USD