... display3.300meters barrier free remote control distanceProduct Name: Wireless video Doorbell(1v2) 1,2.4GHz launch frequency, Approx 300meters ... ,3.5” digital screen, good viewing angle, clear long-range images, Approx 280M barrier free.4,Infrared night vision ... image transmission13,Full-duplex voice speakerphone, voice is loud and clear14,Call button, standby power-saving15,83 effective communication ...