Rechargeable Hearing Aid Invisible Digital In-Ear Enhancer Sound Voice Amplifier Delivery List: Box + Battery Compartment + Hearing Aid * 2 + Cleaning Brush + Usb Charging Cable + English Manual + Lanyard * 1 NOTE: THERE IS NO BLUETOOTH HEADSET FUNCTION, JUST A HEARING AID Host usage time: 30 hours Host standby time: 60 hours Host charging time: 2.5-3.5 hours Main machine battery capacity: 40 mA Charging time of charging compartment: 2-3 hours Charging box battery capacity: 400 mA The number of times the charging compartment can be charged for the host: 4-5 times La horn: dynamic horn Battery model: polymer lithium battery Maximum saturation OSPL90 (db): 1203db High frequency average OSPL90 (db): 1104db Full range sound gain (high frequency average value): 305db Frequency response range: not narrower than 320Hz-4500Hz Total harmonic distortion: 10% Equivalent input noise level: 30Db Rated power current consumption: 1.5mA Rated voltage: 3.7v Feature: 1. Painless wearing, ergonomic shape, making wearing more comfortable. 2. Magnet adsorption charging, convenient and fast, the elderly will not be unable to charge due to shaking hands. 3. The product uses a dynamic speaker, the sound quality is clearer and more pleasing. 4. There are 5 levels of sound adjustment, suitable for people with different hearing loss. 5. Imported chips, intelligent noise reduction, reduce background noise, use moving iron speakers, you can hear more clearly. 6. High battery life, the hearing aid can be used continuously for about 30 hours when it is fully charged, and the charging box can be used to charge the hearing aid 4-5 times. 7. Convenient to carry, the storage box of the product is also a portable box, which can be carried with you and charged at any time. 8. Fingerprint smart touch, simple and convenient, full of sense of technology. 9. Black and white two colors are optional, in line with popular aesthetics. 10. The product is designed to delay the startup of the hearing aid for 10 seconds after the hearing aid is taken out to avoid the troubles caused by the wearing process. (You dont need to turn it on manually, it will turn on automatically after a 10-second delay) 11. The charging chip has an accurate detection function, and the headset is taken out for 3 seconds, and then returned to the warehouse for accurate charging. When adjusting the volume, please do not cover the sound pickup hole on it