Active horn speaker with adjustable bracket and removable suction cup base for attaching to a vehicle roof. Power is connected via a 12V cigar lighter lead, delivering up to 25W power output. A detachable handset houses a push-to-talk microphone along with all controls and connectors for other functions. The top of the handset has ports for USB and SD media to allow audio playback and a 3.5mm auxiliary line input for external audio sources. An integral record function enables a speech message to be recorded up to 120 seconds and played back as a loop. Siren and whistle alerts can be activated by push buttons and, an inbuilt Bluetooth receiver enables wireless connection to a smart phone for playback of audio files or as a remote microphone via various available Bluetooth Microphone apps. Designed for mobile announcements or permanent installation for public address or alerts.