Specifications:

Dimensions: Approx. 127 × 154 × 34 mm
Weight: Approx. 126 g (device only)
Power Source: Built-in lithium-ion battery
Charging Port: USB Type-C
Input: 5V-1A
Full Charge Time: Approx. 3 hours
Materials: ABS plastic, stainless steel, silicone
Included: USB cable, user manual

Precautions:

The device is intended for use on the neck area only.
Do not use if you have a pacemaker or other implanted electronic medical devices.
Contraindicated for individuals with heart conditions, vascular or nervous system disorders, skin diseases, malignant tumors, tuberculosis, orthopedic issues (tendinitis, neck injuries, spinal injuries, spinal stenosis, herniated discs), sprains, osteoporosis, neurological diseases (e.g., epilepsy), impaired sensation, as well as during prolonged use of steroid hormones or in cases of liver dysfunction with capillary dilation, use of painkillers, hypoglycemic or hypotensive drugs, pregnancy, and recovery from surgery or injury.
Not intended for persons under 15 years of age.
Do not use on other parts of the body besides the neck.
Consult a physician before use if you have chronic medical conditions.
Discontinue use immediately if discomfort or any unpleasant sensations occur.

Directions for Use: Place the massager around your neck, ensuring the contact surfaces fit snugly against your skin. Turn on the device and select one of the operating modes. Use the massager once daily for 15 minutes. After use, turn off the device and recharge if necessary.

Portable Multifunctional EMS-Device for Neck and Shoulder Muscles Eviden Smart Neck Extreme HL-SK53