VOICE CHANGER INTERCOM - Protect the true identity of girls and children, and . INFRARED NIGHT VISION - Not lose any details even in darkness. REMOTE CONTROL - Two-way voice calls, clear answers in real time, The visitor and the host are face to face, Let you at ease, go out at ease. TWo-WAY VOICE TALK - High-definition pixel doorbell, video calling, Voice changer. RANGE UP TO 150M - Penetration distance 30-50M, Open distance 100-150M. It is recommended to installon both sides of the door. It is forbidden to install the doorbellon the iron door, affecting the signal., Weight: 0.39903669422 Pounds, Manufacturer: tiyao