About this productFree 2 batteries + 60g Aquasonic100 ultrasound transmission gel included.SpringBud FD-350B 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 lightBuilt-in speaker ensure high-fidelity, clear soundCompatible with both earphone and speakerHigh sensitivity Doppler probe with Low ultrasound dosageAuto Power-Off functionInstructions1. 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 region4. 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.