The device works with a portable lithium (rechargeable) battery. Possibility of working with 2 channels and 4 electrodes (4 electrode pads are included in the box contents) It stimulates the nerves with the electric current it generates that penetrates the skin, providing a suitable and relaxing therapy. KTR-2650 is a multi-purpose device. It provides physical therapy-relaxing massage pleasure with 50 different operating modes featuring TENS (nerve stimulator), EMS (muscle stimulator) and MASSAGE (Fitness). Detailed Turkish User Manual is included in the box contents Transparent hard plastic storage case Tens Program (1-20 programs) EMS Program (21-40 programs) Fitness-Massage (41-50 programs) Ergonomic and Easy to Use/Carry LF (low frequency) electrical signal creates an effective energy field in the application area. Thanks to its 50 program functions, it offers a multi-purpose therapy method suitable for various parts of the body. The applied program, treatment time, battery power status, signal intensity and 2 channel selection can be easily observed on the large LCD screen. Dual TENS electrode pads for each channel and a total of 4 electrode pads enable simultaneous treatment to various parts of the body. The device operates with a rechargeable lithium battery. Technical Specifications; Pulse signal (impulse) frequency; 20-100 HZ for TENS / 1-15 HZ for EMS Program / 2-16 HZ for MASSAGE Program Signal width; 120 µs for TENS / 200 µs for EMS Program / 200 µs for MASSAGE Program Pulse signal shape; Square wave The electrical amount of each independent vibrating pulse during the maximum output power of the vibration amplitude >7µC WARNINGS 1. Make sure that the electrodes are in contact with the body. 2. Improper or prolonged use may cause burning, redness etc. on the skin surface. 3. The surface to which the electrodes will be attached must be clean; application should never be made on an open wound. 4. Use is not recommended for persons with pacemakers. 5. Application should not be made to the abdominal area during pregnancy. 6. It is important to obtain support from a physiotherapist or authorized physician before application. ATTENTION: Your device is covered by a 24-month technical service warranty, and technical service contact information is specified in the user manual included in the box. Since the device in question is a health and hygiene product, unless it is DEFECTIVE/FAULTY after opening the box, it cannot be considered WITHIN THE SCOPE OF THE RIGHT OF WITHDRAWAL in accordance with the relevant provisions of current regulations and sales contracts.