Cadenza A hearing aids with features of Open-Fit style (BTE-OE), hearing comfortably, high clarity, it is non-programmable hearing aid. More convenient for dispenser sales, and also, Open-fit style make user hear comfortably and clarity. New design BTE-OE hearing aids with open-fit style, Intelligent noise reduction up to 13 dB and intelligent feedback cancellation features. Small size with softly and clarity sound, wear more comfortable and hear more clarity during different using environments. Cadenza A with single button to change program only. Short press to change volume, long press to change programs. Presetting program including: Basic (regular setting), High frequency compensation and low frequency compensation. Cadenza A use Zinc-Air battery 312A, with push button. Suitable for patients with mild-to-moderate hearing loss.