I’ve been eyeing the Nexus iSTIM for a while. When it came on sale for 50% off, I bought it immediately. After receiving the unit, I got curious about how much it would cost to buy a comparable TENS unit. I found this on Amazon: link

Specification for the Amazon TENS unit ($40):
Channels: Dual Channel, isolated between channels,
Pulse Amplitude: Adjustable, 0-100 mA peak into 500 ohm load each channel, Voltage: 0 - 50V (Load: 500 ohm),
Pulse Rate: Adjustable, from 2 to 150 Hz, 1 Hz/step,
Pulse Width: Adjustable, from 50 to 300 microseconds, 10uS/step,
Wave Form: Asymmetrical Bi-Phasic Square Pulse,
5 Modes: B(Burst)/N(Normal)/M(M odulation)/SD1(Strengt h Duration)/SD2,
Warranty: 6 Months

Specification for the Nexus iSTIM ($200, $100 sale price):
Channels: Dual Channel, isolated between channels,
Pulse Amplitude: Adjustable, 0-80 mA peak into 500 ohm load each channel,
Pulse Rate: Adjustable, from 1 to 160 Hz, 1 Hz/step,
Pulse Width: Adjustable, from 50 to 260 microseconds, 1uS/step,
Wave Form: Asymmetrical Bi-Phasic Square Pulse,
7 Modes: B(Burst)/N(Normal)/M(M odulation Width Mode)/MR(Modulation Pulse Frequency)/MRW(Modulat ed Pulse Frequency and Length)/SDR(Strength Intensity and Frequency Modulation)/SDW (Strength Intensity and Pulse Width Modulation),
Warranty: 1 year

Both units have a LCD screen, and come with belt clip. The Amazon TENS unit is stronger while the Nexus iSTIM come with 2 more modes. I’d say the iSTIM is probably still over priced even on sale for 50% off. The iSTIM does come with attachments that link the TENS unit to Glide, Neo, Titus, Excel and Vibro. However you can also purchase those attachments from Eden for 27 dollars. less