... hopping frequency,120-200M remote range,OEM video doorbell,color video door phone,video intercom system,3.5" indoor unit,2.4GHz hopping ... for option;Intercom Function,clear talk quality;Calling out,Surveillance,Automatically Unlock and Doorbell,etc functions;Camera Resolution:320* ... in any country.OEM & ODM are both highly welcomed. Wireless Digital Video Doorbell Villa Color Video Intercom System