Huntleigh Mini Dopplex (D900) Nondirectional, pocket-sized doppler is audio-only – all the standard features of traditional Doppler, but at significantly less expense. 5 MHz unit for deeper vessel evaluation, 8 MHz for superficial vessels. Integral loudspeaker and recorder outputs. Includes carrying case, headphones and a 9V battery. Blood Pressure Cuff (#95-600 or #95-186 sold separately) is recommended.