This Baby Sound B Fetal Doppler is designed specifically for home use so expectant mothers and their families can monitor fetal heart rate daily. It is a high performance model with an LCD digital display that is easy to read. The probe and main units are integrated together. Its compact design makes the doppler portable. Both parents will enjoy listening to their baby's heartbeat together through the doppler's two headphone sockets. The ultrasound output intensity is much lower than the government standard, which provides a high level of safety. The doppler has a low power consumption. The unit requires two AAA batteries that can last more than 8 hours for continuous use, depending on battery type.