Hearing Aid Rechargeable Sound Amplifier Ear Digital Earphones Tecnologia Audifono Wireless Headphones First Aid

Hearing Aid Rechargeable Sound Amplifier Ear Digital Earphones Tecnologia Audifono Wireless Headphones First Aid

Features: 1.Discreet thin-wire design 2.High and low tone control 3.Left & right ear adjustability

Specification: 1.Product size:43x15x10 mm 2.Weight:4 g 3..Max. saturation sound pressure level(SSPL):130dB±4dB 4..Model Number: 203S 5.Full on Acoustic Gain:F=1600Hz,45±5dB 6.Total Harmonic Distortion(THD):F>1000H  15% F<1000H  10% 7.Frequency Response:450-3500 Hz 8.Equivalent Input Noise:32 dB 9.Battery: Rechargeable 10.Estimated Battery Life:48 Hours 11.Rated Voltage:D.C 1.5V

Prompt: There are Whistle as you put the battery into the hearing aid .Please donot worry .because the air presure will make Whistle. ​1.Please adjust lower volume . ​2.Choose the suitable ear plug ​3.Make sure if you put the earplug tightly,sound leak will make the Whistle.