... calls 3.300meters 3.5 inch Wireless video door phone intercom system 1.3.5 color LCD display2 ... indoor unit can move freely in the house for any room,Signal strength display, stable signal locations ... Chord melodies include: Ding-dong,ding-dong, Love Romance,FOR ELFSE, Be home,( ),Romeo and Juliet.Garmen fantacy, ... and enters the standby state.If indoor monitor for operation,after 10S , it could take a ...