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1. The 3D support strip design of the spine fits the natural curvature of the back and assists in straightening the back. 2. The 8-shaped shoulder strap and X-shaped back cross-three-dimensional design are adopted to stretch the shoulders and armpits backwards, balance the pressure of the shoulders and back, and help expand the shoulders. 3. Arched back reminder mode, intelligently recognizes that when the back curvature exceeds 15 degrees, it will send a vibration signal to remind the posture correction 4. Three-speed massage mode, adapt to the needs of massage intensity in different states, and massage more comfortably. 5. Product material: ABS 6. Surface treatment: spraying + electroplating 7. Battery capacity: 1800mAh 8. Power: 12W 9. Working voltage: 3.7V 10. Charging voltage and current: 5V 1A 11. Charging time: about 2H 12. Use time: about 120min
