The Sonoline B is an easy-to-use baby sound tracker. Instantly hear your baby's sounds with its built-in speaker. From manufacturer: The Sonoline® B is a hand-held, battery powered audio device. It can even pick up the slightest of sounds in the womb. Fun to listen to baby's movements and heartbeats. The functions include a power button, mode button and volume control. It is also equipped with a built-in speaker, headphone jack and an LCD Screen. The LCD Screen displays the battery status, baby's activity or heart rate in beats per minute (BPM), current working mode as well as the probe type in use. This is not a medical device and is not intended to be used as a medical device nor intended to be used to diagnose, treat, cure or prevent any medical condition nor should it be used as a substitute for your own health care provider's professional advice unless used by or under the direct supervision of a licensed health care provider. Tested. Comes with device and box as shown. No manual. Fast shipping!