... ,intercom function -12 music door bell optional wireless Door intercom System with MemoryConvenient for home, villa, office,hotel, anywhere . 1.World ... -duplex hands-free voice call, voice loud and clear3.Visiting key wake up call, standby power-saving sleep4.83 effective communication ... ’s requirementSizeOutdoor camera:L*W*H=12.5cm*9.3cm*3.5cmIndoor monitor:L*W*H=*10cm*6.5cm*1.5cm ...