Free 2 batteries + 60g Aquasonic100 ultrasound transmission gel included. SpringBud FD-400B Fetal Doppler tracks baby’s heartbeat with 2MHz Probe by using the latest technology. It allows new moms to hear the heartbeat of their babies after 12 weeks' pregnancy in an easy way and reduce anxiety. It comes with an LCD screen, built-in speaker and headphone jack. The LCD screen displays the battery status, heart rate in BPM. Features: Big LCD Display with back light Built-in speaker ensure high-fidelity, clear sound Compatible with both earphone and speaker High sensitivity Doppler probe with Low ultrasound dosage Auto Power-Off function Instructions 1. Connect the probe with the detector’s main body 2. Lying completely flat on the back. 3. Add a glob of ultrasound gel to the stomach region 4. Grab the fetal doppler and place it within the ultrasound gel. 5. Locate directly under the stomach, operating the fetal doppler should slowly slide it up the stomach to the belly button area.