<b>1.How to switch 12/24H system ? </b> <br> Military time to standard time,press forward or backward button to switch it,so easy <br> <br> <b>2.Is the time display always on? </b> <br> NO,After 2 minutes of inactivity the display will darken to save battery Press the power button to display the clock again <br> <br> <b>3.How to set the time stay lit up? </b> <br> Set to Bluetooth Mode(BLUE) and leave it, after 2 minutes the time will show and NEVER GO OFF <br> <br> <b>Specifications: </b> <br> Main Material: ABS /Silicone <br> Screen: LED <br> Bluetooth version: Bluetooth 4.1 <br> support ft./usb: The largest is 32g <br> battery: 4000mah rechargeable battery <br> <br> <b>You get: </b> <br> 1* Mini Speaker <br> 1* USB cable <br> 1* Audio cable <br> 1* User manual<br>