Pendant Neck Protector Cervical Spine Cervical Spine Device Shoulder Features: Five massage modes b Press the mode button for 2 seconds to turn on the power, the power indicator lights up, the think automatic combination mode is 1 gear. Press and hold the mode button for 2 seconds to shut down, and the power indicator will turn off. Click the key/mode key to the mode, the modes are kneading mode, hammering mode, acupuncture mode, massage mode, and automatic combination mode. switching, the think strength is 1 block. Each you press the "+" button to increase the by 1 gear, and finally to the 9th gear; Product Description: A tingling sensation may be due to: Is the electrode pads close to the neck skin? Need to adjust the position to close to the. Is the massage too long? It is recommended to press once for 15 minutes, a day Is the massage too strong? Is the allergic to the electrode pads? Severe allergies require desensitization first Cold climate, dry skin? Use moistening the with a damp towel. Whether there is a wound on the surface, do not put the electrode pad on the wound for massage. The use of the following conditions is prohibited 1. Patients with malignant 2. Patients with bleeding tendency 3. Pregnant women, 4. Patients with acute suppurative 6. Patients with metal implants 7. Near the heart of the human body Contains: 1X Neck 1USB