I purchased the Automatic calendar clock in white for my elderly parents aged in their 90s. We are very pleased with it. My parents can now see the time and date very easily. It was easy to set the clock. There is obviously something built into the clock so that it can adjust itself to leap years. The instructions are actually on the back of the clock so cannot get lost. It came with the one AA battery needed. It also came with s screw to put in the wall to hang it on but we did not need to use that as we already had a hook in the wall. We are very pleased with it.