This is a wireless CMOS 3.6mm mini camera. There are four kinds of frequencies for you to choose. It is powered by Li- battery. The MIC function will be a plus.
A. The Indoor measurement records approximately 150mm thick concrete walls pass through ability. Some impacts may occur on Video Signal Transmission for passing different Structures of concrete walls. The transmission distance is about 15-20 meters.
B. Please avoid co-channel devices and peripherals, so as to avoid interference while using the this type of wireless equipments.