Headphone Audio Adapter for Headphone Jack Adapter ack Stereo Connection SOUND CONTROL: Under POWER-SAVE mode, the display will turn off after 15s, any tap or sound over 60 dB with close distance will wake up the smart led alarm clock. You can turn off this function if you don't want it. AUTOMATIC & ADJUSTABLE BRIGHTNESS: Automatic smart brightness switchable between day (7:00-Brightest) /night (22:00-Dark light). Gradual change 7 levels brightness can be manual selected for this electric digital clock. DUAL POWER SUPPLY: This desk alarm clock come with USB power cable or it can be powered by 4 AA batteries(Not Included) using as a wireless alarm clock. It is so humane and you will not worry about the sudden power outage. PREMIUM WOOD FINISH: Our day date alarm clock comes in an elegant & classy wooden texture, is made up of durable MDF+PVC, and looks aesthetically appealing while uplifting the charm of any modern space  ideal digital alarm clock thermometer for home & office! GIFT WITH GUARANTEE: Makes for an ideal gift for friends, family, and colleagues. Moreover, with our 100% RISK-FREE SATISFACTION GUARANTEE, you have nothing to lose. The easy to access switch for turning off the alarm saves a lot of frustration when you are groggy in the morning.