Amplifier with 30-step adjustable volume for telephone handsets. - Model: AYD-105 - Brand: SMILE KIDS - Features: Automatic on/off - Power: Uses 2 AA batteries - Volume Settings: 30 levels - Application: Handset amplifier Purchased online. I am selling it because my grandmother said she doesn't need it. Opened and tried it once. ★Includes batteries (AA). I hope that those who are willing to accept that it is a used item will purchase it. Keywords: Telephone volume Hearing aid Telephone voice Elderly Nursing care