in case you worry that the bed shaker will not work , it do really shake\/buzz the whole -lrb- twin -rrb- bed in short annoying burst . you can choose vibrate only , vibe & alarm buzzer , buzzer only . the alarm buzzer volume & tone can be adjust a lot -lrb- all be quite annoying & guarantee to get anyone out of bed , esp if you heavy sleeper be awaken first by the bed shaker -rrb- . my daughter will not wake up with a regular alarm no matter how loud . usually I have to go in & harass the poor child , then keep go back to wake she up again ... & again . I work ; I do not have time for that ! this get she awake . the heart shape & color be very cute , & my 11 year old like the rainbow color time display . so far , she do not hate it yet . ; - -rrb- now I be look for one for boy !