25 preset modes for ten devicesPain therapy. - 25 optional massage modes, adjustable by pressing the "+/-" button to increase or decrease the intensity regularly. 25 pre-programmed modes for pain relief. You can also apply 4 pads to two different target areas at the same time. Perfect for treating muscle tension in back, neck, sciatica and muscle aches. 10 high quality electrodes that can be reused 50 times: we use high quality third generation Japanese hydrogel, the fabric is super soft and each electrode can be reused about 50 times. These electrodes are "8" shape so that they can be used anywhere on the body. No need to use conductive cream or gel. Adjustable Intensity and Time - The Tens EMS stimulation current device has an intensity of 50 levels with which you can set the pulse width and frequency and optimize the sensitive controls to relieve your particular pain. A pre-programmed timer can define a standard duration from 5 to 60 minutes. Simple operation. - Simple and easy to use operation, low weight, can be used anywhere and anytime. Built-in rechargeable lithium battery for up to 10 hours continuous use. This product comes with a built-in manual for five countries. If you need the full English version, please contact me to send you an electronic copy of the manual.