Opens & closes using the timer and/or light (LUX) sensor. Configurable fail-safe timer for light (LUX) sensor – closes the door at the set time even if it is still light. Easily adjustable light (LUX) sensitivity when using the light sensor. Manually open & close the with a simple press of the button. Fully featured LCD display for ease of use. Powered by 4 x AA batteries (included) or electric powered via USB (Universal Serial Bus) (not included).; Door closed indicator visible up to 100 metres away. Low battery warning. Full 3-year warranty. All in one design.