1. Usage FD-300C ultrasonic fetal doppler meets the fetus daily check and routine examination at home, clinic,community and hospital. 2. Features ? Easy and convenient operation ? High-fidelity, crystal clear sound ? Earphone and speaker are feasible ? High sensitivity water-proof probe ? Display with color and touch LCD ? Unique ergonomic design ? USB functions to transmit data ? Multiple work modes ? Multiple display modes ? Automatic storage and play back of FHR curve 3. Technical Specification ? Ultrasound frequency: 2MHz ? Ultrasound intensity: <10mW/cm2 ? Power supply: DC Ni-Mh rechargeable battery AC 220/110V, 50/60Hz ? Dimension: 135mm×100mm×55mm ? Display: 65mm×50mm LCD ? FHR resolution: 1bpm ? FHR accuracy: ±1bpm ? Power consumption: <2W ? FHR Measuring range: 50~240bpm ? Weight: 650g