SonoTrax Basic A provides caregivers with the most cost-effective solution to meet routine obstetric and vascular monitoring requirements. Waterproof interchangeable probes, LCD screen, backlight, three operating modes, alkaline battery, easy-to-use compact design, waterproof probe, built-in voice recorder, large LCD screen with backlight, accurate FHR detection with high-definition sound effects, waterproof probes supported for use in obstetrics and vascular monitoring, automatic, medium, and manual operating modes, various power supply options, automatic power-off for energy saving, supports 2 MHz, 3 MHz, 4 MHz, 5 MHz, 8 MHz waterproof investigations