... service, please CONTACT us RIGHT NOW!First, Product Introduction:Light Sensor Doorbell,Chime is quite practical and helpful in welcoming ... languages, you can choose model RD638, this kind of light sensor doorbell can sound 8 languages with 25 melodies. Very ... .Fourth, Features:1) 3M --6M range of light sensor2) 8 languages of " HELLO WELCOME" 3) 25 multiplicate music4) Accurate detecting5) Blister ...