Package Contents & Worry-Free -- 1 x Vent Clip Ball Mount, 1 x User Manual, 12 months Worry-Free, 12-Hour response friendly customer service. Easy to Install -- Twist the knob to release the hook and insert it into the air vent to hook one of the vent blades. Then screw the knob to lock the clip in place firmly. Broad Compatibility -- It not only works as a car mount vent clip, but also works as a GPS vent mount clip for Garmin devices (17mm swivel ball): Garmin Nuvi 1100 1200 1250 1260 1300 1350 1370 1390 1450 1490 1690 (LM LMT T), 2200 2250 2300 2350 2360 2370 2450 2455 2457 2460 2475 2495 2497 2539 2555 2557 2558 2559 2577 2589 2595 2597 2598 2599 2639 2689 2699 (LM LMT LT), 3450 3490 3550 3590 3597 3750 3760 3790 5000 (LM LMT), 30 40 42 44 50 51 52 54 55 56 57 58 60 61 65 67 68 (LM LMT) etc. Retractable Vent Hook Clip -- This car mount vent clip with a retractable (0.67~1.2") hook, which is 50% longer than the ordinary one, and can attach to the deeper vent tightly, enabling it to fit most car vents (round/horizontal/vertical vents). Note: NOT for rotary vents & make sure the hook is down when installed in horizontal vents. Universal Ball Mount Clip -- This car air vent clip could work well with a wireless car charger, car mount, or GPS device whose joint ball diameter is 0.67inch (17mm). And it fits all ZEEHOO wireless car chargers and MagSafe car mounts. Upgraded Anti-Fall Vent Clip -- This vent mount clip with the latest fall-proof locking design ensures your car phone mount or GPS device stays on the vents securely. Even on bumpy roads, the car mount clip won't fall off. All these upgrades provide the most stable user experience.