The MD6 Doppler weighs only 9 ounces (255 grams) and easily fits into your pocket. It has a high quality audio signal available through the built-in speaker or stereo headphones. The blood flow direction is indicated through patented red and green LED's on the end of the pencil style probe tip. Two conveniently located buttons on the probe tip turn the power on and off, and start and stop the chart recorder. The MD6 is powered by rechargeable NiCad batteries and it has an analog output for recording waveforms on the MD6VR Chart Recorder. © 2008 D. E. Hokanson, Inc.