3RD 5.8G Wireless Door Peephole Camera No-interference 5.8G frequency, up to 24 channels for choice,100 meters wireless transmission range Noble and durable pure brass material Same size with original optical peephole. Keep original appearance after installation; 0.008LUX super low illumination, which can see visitor clearly under dim light; 90wide view angle 13.8mm small diameter, which is suitable to all doors with peephole. No need to drill hole, just install directly;