Fireproof material: high-density ABS material, very safe, up to 10 configurable switching programs with 16 combinations of days of the week in a 7-day period, all switching programs want to repeat once a week. Energy saving: Automatically turn lamp, fan, Christmas light and other electrical devices on and off to save energy and streamline your agenda. Built-in battery: Even when the timer is not connected to a power source, the battery lasts the clock is running and the programming time is still saved. EASY TO USE: With a large LCD display and a manual switch, you can skip the switching programs if your plan is changed. Avoid overcharging: The digital timer can automatically turn off electronic devices and effectively protect against overcharging. The built-in rechargeable battery and the optimally designed copper structure extend the service life of the digital timer.