Sonic Boom Vibrating Alarm Clock with Powerful 12-Volt Bed Shaker and Pulsating Flashing Alert Lights, 113db Extra Loud Alarm Sonic Boom Sweetheart Alarm Clock for the deepest sleepers 113db extra-loud alarm with adjustable tone & volume control Powerful 12-volt bed shaker, Battery backup (batteries not included) Pulsating flashing alert lights, and equipped with 12/24 hour time capability 5-level dimmer & test function to ensure your clock is setup properly