The SR157 air vent mount is compatible with devices that feature the Single T-Slot mounting pattern, including XM Satellite Radios (XM Onyx, StarMate, Stratus, Roady, Samsung Nexus & Helix). The mount is also compatible with devices having a 4-Hole AMPS pattern, including satellite radios such as Sirius S50, Sirius XM Onyx Plus, XM Onyx EZ, Sirius XM Lynx, Stratus 7, Dock & Play, and Sirius Dock & Play, vehicle-specific mounts (VSMs), cameras, GPS devices, or audio/video receivers. Holders and devices sold separately. This mount package includes Arkon's air vent mount with swivel ball head and a Single T-Tab to 4-Hole AMPS adapter. The one-piece sturdy spring-loaded air vent mount clip secures onto any horizontal or vertical car air vent louvers, and also includes a support leg that rests on the bottom of the vent for added reinforcement. The swivel ball head of the air vent mount provides 360° rotation, giving you the ultimate flexibility in viewing the GPS from any angle. Garmin GPS devices can be mounted by attaching the mount's 17mm ball base to the GPS device.