Used for one year. Product description: The Sonic Alert Sonic Boom travelAlarm Clock with Super Shaker isa great bedside alarm clock as well as an easy-to-use travelclock. it gas a unique, extra-loud dual alarm for both sleep and wake confidence. It features a large dislay with 5-level dimmer and a powerful bed shaker that allows others to sleep while you wake up to the vibrations. Sleep well with the confidence of knowing you'll wake up on time. 113dB extra-loud alarm with adjustable tone & volume Selectable snooze time from 1 min–30 min Selectable alarm duration from 1 min–59 min 12-/24-hour time formats Dual alarm Battery backup will back up time & alarm settings up to 1 week Green technology uses 60% less energy 5-level dimmer function Includes power cord & Super Shaker vibrating unit