Programmable：It supports 24 hours / 7 days a week programmable.16 ON/OFF programs per day, 15 combinations to a week. Repeat programs with 16 on/off settings, and setting on/off manually. Clear：LCD digital display, LED indicator, reading is more intuitive and clear. Protection：Large capacity built-in CR2450 battery for back-up the memory (save the programs you set) when power failure.Reliable and offer the protaction when use. Convenient：Removable battery design, it is easy to replace, convenient for using.35mm DIN rail mounting, easy to operate, great for household use. Function：With countdown function, maximum 24 hours countdown to OFF.The programmable timer outlet can automatically turns on and off lamps and other electrical devices, save your time and costs on electricity.