Easy to Program Before initial use, if the digital screen is blank, please wire it as the diagram shows on the last paper to charge the internal battery for at least 30 minutes, and when the display showing numbers, it is ready for programming. A built in backup battery could maintain time and schedule settings. This timer can adjust for daylight saving time and compensate for sunrise and sunset variation based on Earth's latitude. 1.PROGRAM: Setting the Clock 2.+ : Adjust UP 3.- : Adjust DOWN 4.MODE: Choose Different Mode 5.RESUME: Erase Program 6.TIME: Setting the Clock Multi Purpose Beside usual heavy duty high power devices, the digital timer box also could be usedfor setting the auto ON/OFF time for some other electrical devices, Christmas/string lights, lamps, grow lights, reptile and other systems for pets. Specifications: N.O. Contacts, 40A Resistive, 120~277VAC. 1HP, 16A FLA, 96A LRA, 120VAC. 2HP, 10A FLA, 60A LRA, 277VAC. 30A Ballast, 120VAC. 20A Ballast, 277VAC. 15A Tungsten, 120VAC. 30A Resistive, 28VDC. N.C. Contacts: 30A Resistive, 120~277VAC. 1HP, 16A FLA, 96A LRA, 120VAC. 2HP, 12A FLA, 72A LRA, 240VAC. 2A Tungsten, 120VAC. 10A Ballast, 120VAC. 10A Ballast, 277VAC. 20A Resistive, 28VDC. Packing List: Digital Timer Box x 1 Instruction Manual x 1 Jumper x 2 Notes: Please read the instruction carefully when you begin to set the timer.