<b>iStim ev-820</b> is your ultimate solution for pain relief. It features <b>5</b> stimulation modes, <b>12</b> preset programs and adjustable pulse width, pulse rate and treatment timer. Just follow the manual and quick guide, then every user can be clear about this machine and incorporate it into your daily life without any problem <br><br> <b>iStim ev-820</b> is the most popular model of iStim Series, and it 's the basic one for the new user. So every function of <b>iStim ev-820</b> is designed easy-to-use <br><br><b>iStim ev-820</b> includes iStim ev-820 TENS unit x<b>1</b>, Electrodes Pads x<b>8</b>, lead wires x<b>2</b>, instruction manual x<b>1</b>, Quick guide x<b>1</b>, 9V battery x<b>1</b>, Sealable Bag x<b>1</b> and carrying case x<b>1</b> <br><br>The <b>5 modes</b> include <b>Burst</b>, <b>Normal</b>, <b>Modulation</b>, <b>SD1</b> and <b>SD2</b>. And the special mode includes(<b>P1~P12</b>), please refer to the quick guide to use the proper program on the proper postion. Besides, large liquid display showing the mode name and all settings is ideal for users to check the setting at any time <br><br><b>Pulse Amplitude</b>: Adjustable, 0-100 mA peak into 500 ohm load <br><br><b>Wave Form</b>: Asymmetrical Bi-Phasic Square Pulse <br><br><b>Size</b>: 10.1cm(L) x 6.1cm(W) x 2.45cm(H) <br><br><b>Weight</b>: 150 grams with battery <br><br><b>Pulse Rate</b>: Adjustable, from 2 to 150 Hz, 1Hz/step <br><br><b>Pulse Width</b>: Adjustable, from 50 to 300 microseconds(μS), 10μS/step <br><br><b>Programs</b>: 5 stimulation modes of Burst(B), Normal, Modulation, Strength Duration 1(SD1)and Strength Duration 2(SD2)+1 Special mode(including 12 programs from P1~P12) <br><br><b>Timer</b>: Adjustable, from 5 to 60 minutes or Continuous. <br><br><b>Battery</b>: 9V Battery <br><br> <br><b>#DO NOT USE extra Electrode Gel with electrode pads</b>