With interchangeable obstetrical and vascular probes, these pocket Dopplers offer versatility. Use the 2 MHz or 3 MHz obstetrical probe to detect fetal heartbeats, or use the 5 MHz or 8 MHz vascular probe to screen patients for peripheral arterial disease, deep vein thrombosis and other occlusive vascular conditions. The vascular probe can also be used to easily monitor difficult pulses and blood pressure. The handheld Dopplers include a built-in speaker, a headset for private monitoring, a rechargeable battery and a soft-sided carrying case. Dimensions: 1.25" x 2.25" x 4.25" (3.17 x 5.71 x 10.79cm). Weight: 10 oz. (0.285kg).