Amzer Swiveling Air Vent Mount for HTC Thunderbolt ADR6400 - Frustration-Free Packaging - Black The Amzer Air Vent Mount is the perfect vehicle mount for HTC ThunderBolt ADR6400! The passive cradle is designed as a custom fit mount for HTC ThunderBolt ADR6400. An innovative alternative mount for your HTC ThunderBolt ADR6400. The air vent pedestal features the socket mechanism with a handy tightening ring. This solution is designed for use only with vehicles having horizontal air vent louvers.