Due to State and Federal Law, we sell Syringes and Needles only to the Medical Facilities. Choice of probes: 2, 3, 4, 5, 8, 10 MHz * Nondirectional Doppler for the detection of vascular blood flow and fetal heart sounds * Size: 5.5" x 2.9" x 1.1" * Power Source: 9 Volt battery (alkaline battery) * Includes: Probe of choice, soft carry case, neck cord, headphones, battery, gel, warranty card and user manual *