Digital Hearing Aid, Wirele Mini Invisible Rechargeable Sound Amplifier, Suitable For Deaf Aid With Moderate Hearing Lo Features: .Discreet thin-wire design .High and low tone control .Left & right ear adjustability . Background noise reduction .Suitable for people with moderate hearing lo (80-90dB ) Specification: 1.Product size:16.6 x11.2 x43 mm 2.Weight:6 g 3.Max. saturation sound preure level(SSPL):130dB4dB 4.Full on Acoustic Gain: 455dB 5.Total Harmonic Distortion(THD):F>1000H 15% F<1000H 10% 6.Frequency Response:450-3500 Hz 7.Equivalent Input Noise:32 dB 8.Battery: Rechargeable 9.Battery Current Drain:4 mA 10.Estimated Battery Life:48 Hours 11.Rated Voltage:D.C 1.5V Packing list: Hearing aid * 1 Silicone earplugs * 4 Cleaning brush * 1 USB charger * 1 Manual * 1 Company information In 2019, it invested and set up a factory in Xiamen to build a large domestic hearing aid production and r&d base with an area of about 12,000 square meters. Since the introduction of automatic production system in 2018, the company has taken the lead in realizing automatic production of hearing AIDS in China. Accurate automatic operation has greatly improved production capacity and made quality more stable