Home use fetal heartbeat products Angelsounds All to one design Power with dry batteries (9V) the probe taking the principal of fetal ultrasound to collect the fetal heart beat signals of fetus characters: small beautiful appearance, strong ability of processing fetal heart signals, invulnerable to outside interference Specification: Utrasound frequency : 3.3 MHz Acoustic intensity: < 10mW/CM2 Peak negative pressure: <1 Mpa Output beam intensity: <20mW/CM2 Dimension: 21cmx16cmx8cm packing:43x47x49cm/30pcs
