Abstract: A self contained device for installation in a vehicle which gives an audible message to remind the occupants to fasten their seat belt. The device includes circuitry for producing a synthesized voice message from a prerecorded ROM and announcing through a speaker. A strap is provided to enable the device to be easily installed under the dashboard of the vehicle. The device is powered from any vehicle source, such as from a cigarette lighter socket and is activated, in its normal mode, when the ignition or accessories are turned on. It is deactivated manually by pressing a normally open switch which is located remotely of the device. In another mode, the recorded message may be manually activated and deactivated by sequential pressings of the switch for warning passengers who have entered the vehicle after the engine has already been started.