Features: 1.Out put of 2 channels-A&B can be used to treat various parts of the body simultaneously. 2.You can choose any of the treatment modes Shoulder/waist joint button/foot) Precautions: 1. The pads need to be sticked on skin, then the device could work. If not, the device will turn off in 2-3 seconds automatically, it is not quality problem. 2. Remember that the two pieces of the electrode are not electrically connected, so as to avoid short circuit after mutual adhesion. 3. Due to the different skin sensitivity of various parts of the human body, the feeling and intensity of the two patches may vary; 4. Electrode patch The two electrodes should not be placed too close together. The two electrodes should normally be placed on the same side of the body (the front and back of the chest should not be used). Technical data: 1. Voltage: DC 3V 2. Rated working time: 30mins 3.Package Includes: Massager*1 USB Cable*1 Power Adapter English Manual*1 Connecting cable*2 (2-way and 4-way) Electrode pads*16( the new pads often can be used for about 50 times,highly recommend to buy more pads)