Some have efficient low-intensity night lights that switch to full brightness when motion is detected. The other option is a keyless entry system, with or without a remote-control lighting system. From a security standpoint, the longer you stand at the door fiddling with your keys, the more time a thief has to attack. A combination-type keyless entry system is effective and easy to operate. Most electronic keyless entry designs are powered by four AA or a single lithium battery that lasts up to five years before replacement.
All models come with keys to open the door if the electronics malfunction.
Many designs use a push-button combination which you preprogram with the numbers. The keypads usually light up when you input the combination, but you will quickly become familiar enough with its feel to do it blindfolded. Other designs look like ordinary door knobs. An LED display is hidden in the top of the lockset. To input the combination, turn the knob until the correct number is displayed.