DescriptionPower tone X-168 In-Ear Hearing Aid is a quality hearing aid which can help you hear the sound clearly and loudly. The volume can be adjusted to 4 different levels. Features:Power tone X-168 In-Ear Hearing Aid is a quality hearing aid which can help you hear the sound clearly and loudly. The volume can be adjusted to 4 different levels. Features:Accurate and easy to useVolume can be adjusted with 4 levels.Help you hear the sound clearly and loudly， whether indoors or outdoors.Maximum loudness 130 �� 5dB.Sensitivity: >/= 50dB.Frequency range: 300Hz ~ 4000Hz.Total harmonic wave distortion :< /=5%Input noise :< /=30dBVoltage: 1.5VCurrent :< /= 4mA