Unlike the lower end models the PRO-78SE features full voice alerts rather than just simple tone alerts in response to radar band detection. The Whistler PRO-78SE is manufactured in the same black body design with selector buttons on the top of the device as well as additional alert LEDs or "alert periscopes"; combined with a bright blue LED display that portrays text information and alerts. The PRO-78SE allows full control over selected scanning bands by allowing the user to pre-select which bands are to be detected.
The PRO-78SE model includes 360 degree detection; meaning it detects radar signals at all available angles combined with multi-band detection support (X, K, Ka, Superwide Ka, VG-2). The PRO-78SE model includes a small LED screen that displays information in a blue text depending on detection and prioritizes certain alerts if there is a lot incoming at one time. In addition the PRO-78SE includes different audio alert features such as a unique stay alert mode that chimes every 30 to 60 seconds, 3 city modes and a highway mode, and quiet and auto quiet modes for times when the user requires the device to be silent. The PRO-78 Special Edition also includes a Dim/Dark mode to allow the user to turn off all lighted alerts and keep the integrated LED display dim to eliminate any distractions or even conceal the device more viably.
The Whistler PRO-78SE device city modes are designed to help eliminate false radar detections in a highly populated area; some false detections can usually be made from automatic door openers installed in nearby stores which use the X band radar emission and the city modes turn this detection band off. The PRO-78SE model includes additional features such as a vehicle battery saver mode, and a Safety Warning System designed to alert of additional highway hazards such as emergency vehicles or road hazards. The PRO-78SE model also includes an integrated filter mode that filters the alert coming through to make sure it is in fact a legitimate radar signal, more specifically it also helps filter out other radar detectors in nearby vehicles that cause a false alert.
The aforementioned "low profile alert periscope" is mounted on the top of the device to provided an added LED alert (flashing) and keep user's further informed.
Whistler claims that all PRO radar devices have a unique POP detection mode; modern radar guns can be set into a special POP mode allowing the device to be used without detection however all of Whistler's PRO model detectors including this one will still alert the user to said detection mode.