This prop is more than just a 'prop' - it can make real cell phone calls using the FONA Feather! It features a vibration motor, speaker and microphone mounted inside the case. You can customize the buttons to call any number you want. The 2500 mAh battery is rechargeable over USB and will provide several hours of energy. Full guide on: https://learn.adafruit.com/3d-printed-star-trek-communicator/overview