Inclusion Criteria:  Chronic pain disease (pain over 3 months) as an adult 19 years of age or older Patients with 11-pointed NRS pain score ≥ 4 for the corresponding pain on the day of admission Patients taking oral pain treatment drugs in the same type and dose up to 1 month before participating in the study, and taking the same medication until 1 month after participating in the study (at the time of obtaining the primary endpoint) Those who voluntarily and in writing consent to participate in the study A person who has agreed in writing to return the Scrambler Therapy device By the classification of pain disorder, patients include with nociceptive pain such as joint pain, myofascial pain syndrome and with neuropathic pain such as postherpetic neuralgia, peripheral nerve injury and nerve entrapment syndrome and with mixed pain.  Exclusion Criteria:  Refusal of the patient In case pain relief effect was not obtained in the past Scrambler Therapy Patients currently undergoing Scrambler therapy for pain control at outpatient clinics at the Pain Center Patients who had previously taken Scrambler Therapy 6 months before participating in the study In case of systemic infection or local infection in the area around the treatment (the patch attachment site) Patients who has cognitive decline that cannot understand the contents of the Numeric Pain Rating (NRS), questionnaire, and scrambler self application method If it is difficult to self-administer 10 scrambler treatments for 2 weeks during the treatment period Women during pregnancy In case of implantation of a pacemaker, brain stimulator, etc. Those who are not suitable for this clinical trial under the judgment of other investigators