Instruction: 1, When you use the timer for the first time, input AC and charge the inbuilt battery please, then press reset button. 2, The timer is at 24 hour mode as default. Press and hold "time" button(bottom left, next to "reset") for 5 seconds till it display "AM" to set to 12 hour mode. Press and hold again "time" button for 5 seconds to set back to 24 hour mode. Programming: 1.Press P to Setting"1 ON" time(display 1 on) 2.Press D+ to Select days of week(if you want same set for every day, you do not need to press this button) 3.Press H+/M+ to Set hours and minutes 4.Press P to Setting "1 OFF" time(display 1 off) 5.Press P to Select days week(If you want same set for every day, you do not need to press this button) 6.Press H+/M+ to Set hours and minutes 7.Repeat step 2 6 to Set other on/off time 8.Press "time"(bottom left, next to "reset") to End it Package Includes: 1 x Timer 1 x English Manual