Rechargeable BTE Sound amplifiers (Pair) Analog sound

Frequency range 300mah 350hz 5000hz

adjustment USB Rechargeable battery charging time BTE Sound amplifiers charging solution Double delay preventing whistling Double layer silicone energy saving charging layer silicone ear needed Portable storage orientation needed Portable Portable storage case power-on delay preventing Rechargeable BTE Sound saving charging solution scroll wheel Specifications silicone ear plugs solution Double layer switch volume control Universal design