Hearing Aids for Seniors with Noise Cancellation Characteristics: 1. Maximum sound resolution: 111 /- 5dB2. Sound amplification:> 30dB /- 5dB3. Total harmonic wave distortion: < 5%4. Frequency Range: F1200Hz, F25000Hz5. Input noise: < 28dB6. Voltage: direct current 1,5 V7. Current: < 1,2 mA8. Full charge within 23 hours, work more than 30 hours9. 300mAh charging box for 3 times charging to produce signal amplifiers by 90 hours of operation.10. Charging box with LED capacity display[Digital hearing aids]: Hearing devices come in a smart chip and art microphone that support sound amplification and are equipped with feedback support. It can help eliminate noise and provide high-quality sound, so you understand well without distinguishing attention. Updated hearing protection system with whistle suppression can chronic users from squeaking[Comfortable wearing]: The hearing aid is checked primarily for people with hearing loss from light to entry. Mini in the ear to be used tightly into the channel with almost invisible, give and comfortable. No one even noticed you were wearing it. Earmuffs with strong suction in hearing aids adapt to the contour of ear injuries and prevent them from falling out. Ideal prezent for younger people to act normally and support themselves by talking to friends and family[Etui with high capacity battery]: Fully charged within 2 hours, hearing aids can be used for more than 30 hours. Za 90 hours, the power will be started in the charging case for the charger[Optional Soft Ear Plugs for Ear Hearing Aids]: All hearing devices come with, medium and advanced ear plugs in different sizes, so you can easily find the highest quality. Ear plugs, which are used for the ear canal, can serve users for greater comfort, and most importantly, can prevent howling.[Sincerely after-sales service]: CONTENTS OF THE SET: 1. hearing aids (left and right ears)*12. Case with powerbank for charging, safe transport and storage*13. Charging cable USB*14. silicone pads*65. Cleaning brush *16. manual * 1