The iStim EV-820 TENS Machine is a dual channel TENS Machine with 12 Preset Programs and 5 Different Modes. The iStim 820 TENS Machine is a good entry level TENS with Digital Display and easy adjustment knobs. 

Modes:

• 1. Burst - Intimate tapping techniques of massage.
• 2. Normal - Provide most steady and consistent massage session.
• 3. Modulation- It can gently cater to your muscle with gradual and frequent waves.
• 4. SD1 - The intensity is always increasing while the pulse width is decreasing.
• 5. SD2 - Similar like SD1 Mode.

12 Preset Programs(P1-P12): Provide users with 12 different preset programs, which target different position and formula

iStim EV-820 TENS Includes: TENS unit x1, Electrodes Pads x8, lead wires x2, instruction manual x1, Quick guide, 9V battery x1, Sealable Bag x1 carrying case x1

Specifications:

• Pulse Amplitude: Adjustable, 0-100 mA peak into 500 ohm load
• Wave Form: Asymmetrical Bi-Phasic Square Pulse
• Size: 10.1cm(L) x 6.1cm(W) x 2.45cm(H)
• Weight: 150 grams with battery
• Pulse Rate: Adjustable, from 2 to 150 Hz, 1Hz/step
• Pulse Width: Adjustable, from 50 to 300 microseconds, 10?S/step
• Programs: 5 stimulation modes of Burst(B), Normal, Modulation, Strength Duration 1(SD1)and Strength Duration 2(SD2)+1 Special mode(including 12 fixed preset programs from P1~P12)
• Timer: Adjustable, from 5 to 60 minutes or Continuous.
• Battery: 9V Battery