Kwikset SmartCode Signature Series keyless entry deadbolts need no hard wiring, run on four AA batteries, and have an expected one-year battery life. They fit standard doors without requiring new screw holes, the maker says, and come in three finishes. Homeowners can create two codes for the locks, one for everyday use and another for temporary access. The system can also automatically lock after a 30-second delay. 800.327.5625. www.kwikset.com.