ROCK Vent Car Phone Holder Ball Joint Gravity Mount 1. Gravity controlment,when cell phone put into the car phone mount, the internal gravity linkage device of this car mount holder will pull the left & right arms inward to hold the phone frimly. Triangle principle ensure your phone is safety and steady. 2. Adopt triangle structural design, stable structure. The holder is made of environmental material with long service life, ageing resistance. 3. Plug and play, one hand operation. Just plug the cell phone holder on car air vent, no need to paste a magnet or sucker. Also no need to put a "patch" on your phone. Keep your phone clean and signal integrity. Soft pads attached inside the three arms, protect your phone from scratching. 4. Preoccupation with the materials and processes will well worthy your lovely car, matched with mac material and process. 5. Dual different crack size for car air vent outlet, which can match most of car air vent. And it supports 360 degree adjustment,you can rotate the car cell phone mount to the suitable sight. 6. Reserve charging hole, it allows you charge your phone when put in the car phone holder. Meanwhile, it can protect your phone from dropping if it connected with a cable and holds phone perfectly in view without obstructing vision.