Whistler"s ergonomic and user-friendly design provides a new level of operating convenience. It"s bracket release button p provides quick and easy release of the mounting bracket. It"s mounting bracket location slot holds mounting bracket firmly.Whistler XTR-440 Radar Detector - X-band, K-band, Ka Superwide, Ka Band, Laser - VG-2 Alert, VG-2 Immunity, Spectre Alert - City, Highway - 360 Detection