Introduction : 1. Usage Lovebaby 100A ultrasonic fetal doppler meets the fetus daily check requirement between routine examinations mainly at home, community and clinic. 2. Features ? Easy and convenient operation ? High-fidelity, crystal clear sound ? Earphone is feasible ? High sensitivity doppler probe ? Low ultrasound dosage ? Unique ergonomic design 3. Technical Specification ? Ultrasound frequency: 2MHz ? Ultrasound intensity: <10mW/cm2 ? Power supply: 9V Alkaline battery ? FHR Measuring range: 50~240bpm ? FHR resolution: 1bpm ? FHR accuracy: ±1bpm ? Power consumption: <0.8W ? Main body dimension: 135mm×60mm ×55mm ? Weight: 180g