Fig. 1
A–E The P02 is a digital programmable body-worn hearing aid. Its size dimensions are 65 mm × 45 mm × 15 mm, it has a built-in rechargeable battery, and its total weight is 25.7 g. The P02 device consists of a channel for programming the adjustment system (1), a battery capacity indicator (2), an ear receiver (3), an ear mould (4), an on/off switch (5), a channel charger (6), a battery compartment (red asterisk), a programme button (7), an amplifier speaker (blue asterisk), a microphone (8), and a volume control (9). The P02 has a 2-channel wide dynamic range compression with 5-band equalizer hearing aids. It has 4 memory slots with multi-memory tone indicators. Digital signal processing in the P02 provided sound with a maximum amplification output of 123 dB and an average peak gain of 66 dB. Regarding the occlusion effect, we adjusted the low-frequency gain and modified the ear mould with venting following an adjustment to the individual hearing threshold level