it is a compact and stylish wireless charging alarm clock. Place your phone on the ray and your Qi-compatible mobile devices will wirelessly charge. You can also conveniently charge your smartphone or other USB compatible devices with the USB charger port. The clock display has dimmer controls and snooze function to round out features. This clock is, electrically, operated (the battery backup does not power the clock). The battery back-up is used to store the time and alarm settings, if power is interrupted.