specification: _x000D_Item Type: Hearing Aid_x000D_Material: Plastic_x000D_Power Supply: 1pc button battery (a hearing aid) (Not included)_x000D_Battery Model: LR44H_x000D__x000D_Usage:_x000D_1. Turn the volume to level 1 before use_x000D_2. Please check whether the switch is in the "ON" position and put the hearing aid in your ear_x000D_3. Slowly adjust the volume to an appropriate level_x000D_4. Choose high or low sounds for better listening_x000D_5. Be sure to shut down after use to save energy_x000D__x000D_On/off_x000D_OFF Position: Turn OFF the machine_x000D_L position: turn machine on low pitch_x000D_H position: Turn on machine high pitch_x000D__x000D_Volume control:_x000D_1. Turn the volume regulator counterclockwise to reduce the volume_x000D_2. Turn the volume regulator clockwise to raise the volume_x000D__x000D_Notes:_x000D_1. This product is not waterproof, so users must pay attention to prevent water from entering the battery, and then place the machine in a warm place for machine operation_x000D_2. Use it when the situation requires amplification, such as movies, TV, etc., which cannot amplify extreme sounds_x000D_3. Turn the machine to the OFF (OFF) position when not in use for a long time_x000D_Storage: Store in a well-ventilated, dry place where the relative humidity does not exceed 80% and there is no corrosive gas Features: 1The sound quality is clear, low power consumption, distortion is small. 2Present the natural original sound, whether in the home or in the noisy street, can hear all the sound clearly. 3Ergonomic design, small and beautiful, without weight bearing, easy to use. 4Earplugs are made of food?grade silicone, easy to remove, easy to wear, skin?friendly and environmentally friendly. 5Noise reduction function, can reduce the noise caused by the noise, protect the hearing, increase the comfort and clarity of listening. PackageList: 2 x Hearing Aids 6 x Ear Plug 1 x Storage Box 1 x Manual