Sonic Alert, SBT425-SS, Sonic-Alert SBT425ss Sonic Boom Loud Vibrating Alarm Clock with Telephone Signaler . The Sonic Boom SBT425-SS has been designed as a cost effective full featured bedside alarm clock with telephone signaler, built-in flashing lights and bed shaker. alarmalramawakeshakevibrating in Shoppingwith alertboomloudsbt425-sssbt425ssshoppingsonicsonic-alert