Specifications: 1. good sound quality. 2. Model:- Cyber Sonic Hearing Aid 3. Material:-Hearing aid:-ABS, Ear Cap:-Silicone 4. saturation sound pressure level: 125db 5. full-on acoustic gain45db 6. frequency response: 450-3800hz 7. equivalent input noise: <30db 8. operation voltage: 1.5v 9. operation current: 10.8ma Easy operation: 1-A key switch, a key to adjust the volume, the user can according to need to adjust the volume size, watch it and you understand; 2.Low frequency noise control: Form suitable for the frequency response of slope type hearing loss output, a wide range of accuracy and effective sound control, able to go outside all kinds of noise; 3.Convenient to carry: Small hearing aid, convenient to carry, go out communication and travel; 4.MPO maximum output control: Effectively adjust the amplification input voice loudly, can choose frequency output limit, corresponding uncomfortable threshold properly adjust the maximum output. Main function: with the function of damping and cushioning, it can avoid or mitigate damage to the head when the head of infant is collided and shoudler Protection .When the infant falls forward, the an incline towards the face for protection at the moment of touching ground The Adjustable Headguard Protective have advantages of shock absorption, impact resistance, good air permeability, soft, non-toxic, odorless, antisepsis, environment protection, etcPackage Content: 1 x Baby Adjustable Headguard Protective. Packing list: 1 unit hearing aid / 3 ear plugs/ 3 batteries / inner box / an English& espanol manual / color outer box