1080P (1920 x 1080) IP HD cameras give you crystal clear videos day and night・ 2.4GHz 4ch wireless transmission・ no need for cables・ save the costSmart link technology: cameras are connected to nvr automaticallyTransmission distance up to 328' or 100M・ and can travel through walls up to 100' or 30MSurf the internet by one-step・ access and control. scan QR code on DVR from desired app to instantly access live viewing and playback Easy Preview remote playback on your smartphone and computer from anywhere anytime; receive email alerts and mobile notifications when motion is detected.