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V/S button can realize two functions: 1, shifting the two ways of display: only time, or alternate between time/date/temperature in cycles. 2, turning on/off Sound Activated Function. It means that it controls whether display stays on or not. For how, please read through the instruction. How to adjust brightness: (only work in Display Alternating Mode) 1, Make sure your clock is set to alternate between time , date and temp; 2, Press and hold "UP" button until you see "8:01" on LED display. 3, Then press "UP" again to change to "8:02" and "8:03". You could notice that the clock is diming. "8:01", "8:02" and "8:03" are representing the three options of brightness. Please check it out now. If you lose the instruction or have any problems/concerns about the clock/setups, please don't hesitate to contact us. We could help you with it. Package: 1x LED Clock 1x USB Charging Cable (Please use your own USB charger with 5V output, like average cell phone charger) 1x Instruction