Invisible Rechargeable Cic Digital Ear Hearing Aid Device for Adults Deaf Sound Assist Oxhiren G37D. Rechargeable Battery Life: Provides 15-20 hours of continuous use on a single charge. 16-Channel Digital Processing: Features advanced WDRC processing for high-definition sound quality. FDA & CE Certified: Approved by FDA, CE, RoHS, and ISO13485 for safety and quality. Customizable OEM/ODM: Offers full customization, minor customization, and design-based options. Multi-Color Options: Available in Red, Blue, and Beige to suit personal preferences. Fast Charging Capability: Fully charges in 1.5 hours with a convenient charging case. 5 Volume Levels: Allows easy volume adjustment with 5 preset levels via button press. Mild to Moderate Fit: Specifically designed for individuals with mild to moderate hearing loss.