... D.N.D 4: Clean,door bell Used outside bedroom Touchable hotel Smart touch screen switch fpr hotel with door bell, clean, do not disturb ... -working condition: light blue Service life: When relay contacts 220V in the full load, life expectancy greater than 10 million ... Gold, Silver, White (other can be customized) Smart touch screen switch fpr hotel with door bell, clean, do not disturb, wait functions