Vent Vehicle Mount Cradle Designed for Magellan Maestro 4250 - Unique Auto Car Holder Clips into Air Vents. Gomadic Holder is highly adjustable with sliding/rotating mechanisms on side and bottom ensuring easy access to all Magellan Maestro 4250 buttons and controls. Spring loaded vent clips designed to accommodate both horizontal and vertical oriented air vent systems. A vent mounted cradle base for use with the Magellan Maestro 4250 device. Holder is designed to adjust to accommodate the exact required dimensions (125.7 x 84 x 18.4 mm). Specifications: Holder Base: (2.5 X 4.0 inches in closed position. Highly expandable), Vent Mount (2.0 x 2.5 inches), Weight (Base 4oz., Mount 2oz.) Gomadic holder base is simple to use and will set up and store in seconds. Built using a failsafe mechanism to safely and securely hold device.