Effective performance.  Good construction. 2 channel, 4 outputs.
This is an upgraded version of the usual consumer level TENS/EMS device.  It's a very capable device, able to deliver effective electrical signals to effect muscle and nerve stimulation.  In fact, the levels of intensity are probably more than ample, with most users finding the lower levels more than adequate.<br />It seems that the primary upgrade is the addition of an output port for each channel.  So, you can actually affix four sets of pads, 2 per both A and B channels, to either form an extensive treatment or to share a 'massage' session simultaneously.  Keep in mind that each channel has a set output, and adding pads will share that intensity.  So, you may find that you'll increase the intensity levels to accommodate the shared load.  Then, if you opt to use just one set of pads per channel, you will need to adjust for that instance (so a lower intensity will feel the same, within your tolerance levels.<br />I have a slight issue with the two side buttons.  It's very difficult to identify them using their markings.  Fortunately, it's just two buttons. The top button is the power button, where a long press will turn it on/off. The lower button is the 'lock' button.  So, if you get confused and long press the lower button to turn it on, you'll notice nothing happens. Then repeat the long press on the top button, and the display will light up, and you're ready to select your mode, timer and channel intensities.<br />Operation if fairly simple, especially if you've previously used a consumer TENS/EMS unit.  The M button allows the user to select the massage mode. T button cycles at 10 minute increments the timer function (the default is 20 minutes, but you can cycle through and get a 10 minute option).<br />This device is well equipped with 24 modes and 20 intensity levels.  However, the only specification provided regarding the battery is that it takes 2 - 3 hours to charge the battery. And, the product details states that it lasts 20 hours 'Standby Time".  I have no idea what 'Standby Time" means, and at what manner of settings it includes.  Perhaps, it's 20 hours of just being turned on? This lack of definitive battery capacity rating and operating time dings the rating.<br />This issue with the battery and operating time specifications is unfortunate.  The product displays decent design, materials and manufacture.  And the current cost of $32, including a 20% discount, makes it very reasonably priced for it's quality level in the product genre.  Attached are photos to show real world images, with a ruler for size reference. Various angles and views are provided to afford a good overview of the device and included accessories.<br />Accordingly, this product earns a 4.5 star rating, with a moderately high level recommendation.
Rating: 5 stars