This clock can show the time, date or indoor temperature with an invisible diaplay LED. It looks like wood when it doesn't diaplay, and you can touch or clap-activated to make it display. As an alarm clock, it also has alarm clock function. It need 3 AAA batteries or a power adapter. You can choose it to show only the time, or have a cycle between time, date and temperature. If you use the power adapter it will constantly be on. If you have it running on batteries, it goes on if you clap your hands or tap on it.