The SonoTrax Basic is a top-tier, compact ultrasonic doppler featuring a digital LCD display for Fetal Heart Rate (FHR).Ideal for routine check-ups by obstetricians or midwives, the SonoTrax Basic is highly favored by expectant mothers, providing reassurance throughout pregnancy stages (FHR can be detected from around 10 weeks).features• User-friendly, lightweight design• Simple operation• Continuous wave doppler technology• Large, easy-to-read LCD screen• Precise FHR detection with excellent audio clarity• High-sensitivity, interchangeable probe• Volume control via dial• Auto power-off function• Compatible with 2Mhz, 3Mhz, 4Mhz, 8Mhz waterproof probes• Uses LR6, AA 1.5V x 2 alkaline batteries (not included)• Supports rechargeable NI-MH Battery AA, R6, 1.2V x 2 (not included)• Offers both automatic and manual FHR counting