1. Dual-hinge stretch structure with dual-bar support for enhanced security. 2. Foldable and stretchable design with knob lock, ensuring convenient use by one or multiple people. 3. Devices compatibility: Applicable device size: 4.7-13 inch 4. Headrest spacing: 70-158mm 5. Quick installation, double-spring design 6. Easy to use, one-handed operation, 360 degree free rotation
