Neckband Bluetooth Hearing Amplifier For Seniors Semi-In-Ear Design With Digital Sound Chip, Long-Lasting Battery 1. Neckband Bluetooth hearing aid designed specifically for seniors, integrating high-precision sound amplification with wireless Bluetooth headphone functions. Features a semi-in-ear design, digital audio processing technology, and long-lasting battery life, ideal for comfortable daily use. 2. 16-Channel Digital Sound Processing: Equipped with a built-in 16-channel digital chip. Utilizes multi-channel technology to process audio signals, delivering refined sound quality while ensuring stable performance through low-power operation. 3. Dual Mode Switching (Hearing Aid & Bluetooth 5.2 Headphones): Functions not only as a hearing device but also supports Bluetooth 5.2 connectivity. Easily switch to music playback, calls, or video-watching modes to meet diverse needs. 4. Anti-Loss Neckband Design: Lightweight neckband structure weighing only 31.4 grams, stays securely around the neck when not in use. Ergonomically shaped to fit different body types. 5. 100-Hour Battery Life + Type-C Fast Charging: Offers up to 100 hours of runtime in hearing aid mode and 25 hours of continuous use in Bluetooth mode. Type-C interface enables rapid charging, minimizing waiting time. 6. Skin-Friendly Material for All-Day Comfort: Made from soft, hypoallergenic silicone material with a memory rebound structure. Resists deformation during long-term wear and fits discreetly under clothing, avoiding any obtrusive feeling. 7. Simple One-Button Operation: Intuitive buttons allow for easy volume adjustment or call management, requiring no complex learning curve, making it effortless for seniors to use. Parameters: 1. Maximum Saturation Sound Pressure Level OSPL90 (dB): less than or equal to 125db+-3db 2. High-Frequency Average OSPL90 (dB): 110dB +-4dB 3. Full Frequency Sound Gain: 52dB +-5dB 4. Frequency Response Range: not less than 400Hz-4000Hz 5. Total Harmonic Distortion: less than or equal to 3% 6. Equivalent Input No