How to use it------ Battery: 2*AAA batteries (not Included)【1】Button Function: [a] Press "S" button for 3 seconds to turn on, press three keys at the same time to turn off. [b] Press "S" to select alarms 1/2/3/4. [c] Press "H" button to set hour and "M" to set minute. [d] Press "S" to confirm setting. 【2】Time Setting: [a] Alarm power on, the default time setting interface is displayed. Press "S", the clock pattern in the upper right corner flashes, and the pattern can be set clock. [b] Press "H" button to set hour and "M" to set min. [c] Press "S" to confirm setting. [d] Reset the clock, press "S" continuously. When the clock pattern on the upper right corner flashes, you can reset the time. [e] Press "S" to choose the 12/24 hour format.【3】Alarm Setting: [a] How many alarms can you set? ---> You can set up to 4 alarm mode. [b] How to stop the alarm? --->Press any button to stop it after lhe music alarm rings. Otherwise, the alarm will keep ringing until press any button to stop.