ST-307 Smart Home Office Car Multi-Function Cervical Massager Shoulder Neck Massage 1. Constant temperature hot compress, double relief 2. Microcomputer accurately controls temperature to avoid overheating 3. Long-lasting battery life, lightweight and portable, TENS pulse 4. TENS low frequency pulse, improve blood circulation, relieve neck fatigue 5. Intelligent CPU chip, charging power-off protection 6. Battery capacity: 900mah 7. Power mode: USB charging built-in lithium battery 8. Applicable parts: neck, arms, legs, shoulders, trapezius 9. 6 modes: automatic mode, cupping mode, hammering mode, massage mode, acupuncture mode, relaxation mode 10. Massage contacts: 4 11. Function: 10-speed intensity adjustment, voice broadcast, 15-speed pulse intensity 12. Elastic arm design, adapt to various neck curves 13. Rotation force button, two-button control, simple and fast 14. Massage principle: EMS microcurrent 15. Charging time: about 2 hours 16. Rated current: 1A 17. Working voltage: 3.7v 18. Rated power: 5w 19. Dimensions: 16.5x14x3cm 20. Weight: 91g