... recognize the authorized person or their cell phone or Bluetooth-enabled device. If the security system detects the identification of a valid person, it releases the baby carriage for use - the status LED in the handle changes from red to blue. This anti-theft function is designed to ensure that the baby carriage cannot be moved by unauthorized persons. The adjustable speed limiter ensures that the baby carriage does not move faster than desired, which can be pleasant on longer downhill stretches.