2150 Student Humpback Vibration Reminds With LCD Hanging Neck Corretor(Black)

1. Non-sensory design, no top chest, no blocking, no restraint2. Lightweight and comfortable, no pressure to wear3. Scientific angle reminder, correct sitting posture through vibration reminder4. U-shaped design is ergonomic, fit the neck curve, no sliding5. Material: ABS + silicone6. Charging voltage: 5V7. Rated current: 0.12A 8. Rated power: 0.6W9. Charging time: about 3.5h10. Battery capacity: 150mAh11. Charging port: USB12. Suitable age: 4 years old and above13. Size: about 26 x 9 x 1cm (straightened)14. Weight: about 70g