The high performance transducer enables reliable detection from early gestation right through to delivery, even on obese patients. Advanced real time auto-correlation fetal heart rate processing - Active noise reduction for crystal clear fetal heart sounds - 2MHz waterproof transducer suitable for use in a water birthing environment (FD1) - 3MHz waterproof transducer suitable for use in a water birthing environment (FD3) Advanced power management with auto switch-off to conserve battery life - Long robust coiled cable enables optimum transducer position in all circumstances