

Product model | A-28 |
Working voltage | 3.7V |
Battery capacity | 35mAh |
Endurance | About 20 hours |
Maximum OSPL90 | ≤113dB + 3dB |
High frequency average OSPL90 | 107dB±4dB |
high-frequency average | 28dB±5dB |
Total harmonic distortion | ≤7% + 3% |
Frequency Response Range | 450Hz - 3000Hz |
Equivalent input noise level | ≤29dB + 3dB |
Product size | 31.4×13.5×17.9 |
Weight | 5.3g |
C***s - Greece - Apr 11, 2025
Great packaging, fast delivery and as always the best communication with this company!! Thank you a lot!!!J***Z - United States - Jul 15, 2021
Good product and good service as usual. Will continue to keep working with the supplier.G***i - Brazil - Jun 4, 2025
Delivery : Fast and secure delivery. Quality: Products always delivered in excellent condition, with no defects or issues. Service: Impeccable service — they always reply quickly and help me with everything I need.C***o - Bolivia - Feb 18, 2025
I appreciate the quality of their packaging.M***H - India - Jun 10, 2023
Great product. With 4 modes of hearing gives really flexible options to adapt to the surrounding. Particularly masking mode really very effective .Added to this gives mobile app control and tuning features. Bluetooth is a bonus.m***e - Jordan - Jul 17, 2024
I received the shipment and it was very good and the shipping time was very fast and the manufacturer was also very nice dealing with the employee Lisa was very helpful with me thank you very muchc***u - United States - Jun 4, 2025
I have been working with Shen Rui for over a year now and it has been a very great process. The products are of amazing quality and the service, delivery, and customization really brings everything together nicely. Couldn't grow without them. Looking forward to a long term continuous partnership.J***z - Spain - Mar 5, 2025
This is a fabulous product, as my father, due to limited resources, used to refrain from spending €2000 on typical options. His friends say he is back in conversations and participates like he used to. The exceptional attention from the customer service team at Shenrui has been a gift for me and has also helped close friends who have ordered through me because they are older and do not navigate payment gateways well. Cheryl, in particular, has been the person who guided me through all my doubts and the entire process, making us more like friends than partners. I have nothing bad to say; it is a miraculous itemK***a - Mexico - Mar 4, 2025
Excelente. The goods are high quality, the shippment is fast, direct to my home and the supplier is very kind and professional. Thank you for everythingN***r - Botswana - Jan 7, 2025
Packaged well, shipped via LCL. Very good quality, no defects found, good finish, strong materials. Service by Lisa Liu was excellent, very helpful & thoughtful. Assisted me with my small sample order. I would highly recommend this company for their quality products and competitive pricing