User manual Loud alarm clock for Heavy Sleepers - loud alarm to ring for 50 minutes, till you wake up and turn it off. Alarm is loud enough to get you up. Battery operated alarm clock - battery operated alarm clock works far longer and is less likely to run out of time than the wind-up alarm clocks of the 1980s that frequent winding essential. Just two brand new AA battery (not included) is required to run the clock for 8 months even longer. Silent No Ticking - This bedside alarm clock is quiet and does not make annoying ticking sound. It is suitable for people who are sensitive while sleeping. Snooze and Light Function - Hold button down for 5 minutes snooze or to light up the clock face on demand to see the dial in the darkness. Easy to use - The big numbers and clear face are perfect for seniors or anyone who wants to check the time at a glance without squinting. It has large top buttons and oversize switche on side, No more fumbing.There are only two knobs on the back, even the elderly and children can easily set the time and alarm clock