... /Doorbell function color video door phone,wireless video intercom system,villa video interphone,200M remote distance,Monitor/Talk/Doorbell ... Version camera,work well even in dark environment;2.4 G Frequency-Hopping Spread Spectrum technology afford stable digital ... for option;Intercom Function,clear talk quality;Calling out,Surveillance,Doorbell,etc functions;Camera Resolution:320*240 pixels;Power ...