Item Type: Hearing AidsMaterial: ABSMaximum Sound Output: 122+/- 3dBSound Gain: 28dB+/- 2dBTotal Harmonic Distortion: 3%Frequency Range: 300-4800MHzInput Noise: 26dBHeadphone Lithium Battery: 35mAh (Included)Package List1 x Hearing Aid Earphones1 x Earphone Storage Box5 x Earmuff1 x Large Storage Box1 x Brush1 x Cerumen Stick1 x Screwdriver1 x Battery Compartment Door1 x Manual1Using medical grade silicone material,adopting ergonomic design, not easy to fall off. 2Bluetooth and earphone for hearing aid, combined into one, easy to use and convenient. 3There are different sizes of our hearing aids, which can be suitable for everyone. 4Imported chips, excellent sound quality and stable transmission, can prevent howling and reduce noise. 5You can watch TV, hear birds singing, chat at ease by using this digital hearing aids.