The buttons, LCD position, & other elements of this compact design were carefully designed based on ergonomics to allow installation in a wide variety of places. The simple, elegant appearance matches various room interiors. Power consumption is automatically reduced when the handset is close to the base unit for extended talk time. Battery life on talk is up to 10 hours when in Eco Mode. Night mode means that you can select a period of time during which the handset and/or base unit will not ring for outside calls. This feature is useful for time periods when you do not want to be disturbed, for example, while sleeping. Night mode can be set for each unit.