High-performance doppler with FHR digital LCD backlight display. Audio output, which can be connected with earphones or a recorder. Can be operated with 4MHz or 8MHz probe for vascular diagnosis. Ergonomic, compact and light design. Accurate FHR detection with clear sound. High-sensitivity interchangeable probe. Supports 2MHz, 3MHz, 4MHz, and 8MHz waterproof probes. Automatic and manual FHR counting. Long-time continuous use of about 8 hours. Automatic power-off. Includes: Doppler with Waterproof Probes x 2 (4MHz, 8MHz)