We are offering fetal doppler. Features :. safe ultrasound dosage is under 50 % of the standard. . portable light weight, handset, portable. lcd display large display with blue backlight. loudspeaker built-in-loudspeaker & clearly. support 2mhz, 2.5 mhz, 3 mhz waterproof probe. Accurate fhr detection with clear sound. sensitivity monitor 12 weeks above unborn baby's blood wall pulsate