The alarm clock that woke George Lutz (Ryan Reynolds) at 3:15am throughout the film.  Also used by Ronnie DeFeo at the beginning of the film

This is the alarm clock first seen at the beginning of the film as Ronnie DeFeo has been woken at 3:15am to kill his family, and then is seen countless times throughout the film as it wakes George Lutz (Ryan Reynolds) in the middle of the night, also at 3:15am every night. The alarm clock is still in the exact screen-used condition from filming, and comes directly from Platinum Dunes Productions.