"Dramatically Improve Hearing!" Amplifies sound by up to 30dB, supporting the transition from "hearing" to "clearly understanding." This allows for a clear understanding of the content. With 16-channel support, the sound quality is exceptionally clear. Each channel handles a specific sound range, achieving a natural sound transition. This ensures clear conversations and crisp sounds even in complex environments. "Effectively Prevents Feedback!" Comes with three sizes of ear tips, allowing you to choose the size that fits your ears comfortably, preventing them from falling out or leaking sound. Furthermore, the close-fitting ear tips firmly suppress sound leakage. In addition, advanced algorithms suppress unwanted sound reflections, achieving clear hearing. The collaboration of ear tips and algorithms provides triple protection against feedback! "Music, Calls, and Video Viewing, All in One!" Equipped with Bluetooth 5.3, easily connects to iOS and Android devices. You can comfortably enjoy music playback, calls, and video viewing with this single device. Furthermore, it can connect with smartphones, laptops, tablets, and BT TVs, allowing simultaneous connection to two devices. Switching instantly with a single tap makes your busy days even more convenient! "Achieve Sound Tailored to You!" Features a hearing test function that provides individually optimized hearing. Easily perform the test with the dedicated app, and the results are displayed clearly in a graph. Based on this data, the sound is automatically adjusted, and further fine-tuning is possible with the equalizer. "Easy Operation & Latest Technology, Achieve the Perfect Hearing for You!" With 10-level volume adjustment, fine settings are possible, achieving optimal hearing. Also supports independent left and right volume adjustment, allowing comfortable use with a balance tailored to each ear. The dedicated app offers intuitive operation, and settings are completed smoothly. Anyone can easily use it. Furthermore, equipped with the latest OTA technology, Cearvol Hearing Amplifier Bluetooth 5.3 Wireless Earphone Type for Seniors, 36 Hours Long-lasting Use, Fast Charging, App Hearing Test, Voice Amplification, Comfortable, Supports Calls, Music, and Videos, Feedback Suppression, Noise Cancellation, Clear Sound Quality, Compatible with iPhone/Android Smartphones, Discreet, Individual Volume Adjustment, Lightweight, Compact, Sponge Ear Tips Included (White)"