PROMEND SJJ-297B Handlebar Stand Model Bicycle Phone Holder Universal Aluminum Alloy Electric Bike Mount1. Bracket adjustment knob adopts mechanical locking, stable and solid, not easy to loosen 2. Knob shaft can be easily adjusted for loading cell phone, four grips with non slip shock absorbing spacers, no harm to the cell phone 3. Reserved buttons and interfaces, do not block the screen information, more convenient to ride the operation 4. 360 degree spherical adjustment axis design, more than plane adjustment, no visual dead space, more comfortable