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Installation of Batteries: Tear off the sticker upon the lid of the box,then find the batteries holder on the backside of the lid, open it then install two AAA batteries that LCD screen will display number,after that pulling out the thumbtack so that let the spring bolt pop out.(When LCD screen is not displaying number, please do not pull out the thumbtack,otherwise the lid could not be opened) Silent and Non-Slient Mode: Press and hold S button for 3 seconds to exchange silent and non-silient mode when you hear of a beep sound. How to open the box Press the M and H buttons at the same time to open the Lid and clear number to “0” Setting the target time to unlock Press H button to set hours , press M button to set minute, putting stuffs inside the box then press S that will be count down. Continuous press and hold the button can fast setting. How to start lock the box Press S button to ready for countdown, LCD will leave extra 5 seconds for consideration. Within 5 seconds count down ,you can press any button to stop and cancel the setting. After 5 seconds ,the timer will start to count down and the Lid can not be opened when you press H and M buttons. The LCD displays sign “LOCK”,after that the lid could not be opened.You need wait for the time count down end then open automatically, the LCD displays sign “LOCK” How to reset the timer box If you want Reset the time box, please follow the instruction below: First of all, lifting up the black protective film with the knife softly around the LCD screen,there is a hole at the right of the LCD; Please find a metal pin or metal clip and insert it into the hole to the end and carry it out; Normally if you hear a beep sound (non-silence mode) , the LCD will display properly. The time box is being successfully reset