A vibrational alarm device for use in combination with an alarm clock, includes a receiver for receiving a RF alarm signal transmitted by the alarm clock, an operating circuit for providing an operating signal in response to the receiver receiving the alarm signal, and an electro-mechanical vibrator for vibration in response to the operating signal provided by the operating circuit. A casing houses the receiver, the operating circuit, and the vibrator for vibration by the vibrator to provide a vibrational alarm signal.