2Mhz/3Mhz/8Mhz Probe for Fetal doppler Sonoline C1/C, FD300, FD320 Frequency:3Mhz The FD220 outputs a high-quality

The FD220 outputs a high-quality audio signal through the unit’s dual headphone jacks

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Automatic shutdown function in one minute without detecting user input

63lbs Power Source: Two AA batteries

Ultrasound Gel

2Mhz/3Mhz/8Mhz Probe for Fetal doppler Sonoline C1/C, FD300, FD320 Frequency:3Mhz The FD220 outputs a high-qualityThese probes Sensors works with Sonoline C1 C, FD300 and FD320 Fetal Doppler. We have 2Mhz probe, 3Mhz probe, 8Mhz vascular probe. The 2Mhz 3Mhz probe could be used to hear your baby's heart beat. The 8Mhz probe are vascular Probe. If you want to hear your baby's sound movement, please choose 2Mhz 3Mhz probe. A 3MHz probe is recommended to detect a heart rate in early pregnancy (8 10 weeks gestation). A 3 MHz has also been proven to work well