The B-Series Infrared Illuminators by AXTON like the Alpha series are built around 850 nm (semi-covert) and 940nm (fully covert) high efficiency LEDs. Unlike the Alpha series , they DO NOT incorporate the automatic photocell activated day/night switch. This allows the B-Series to be more easily integrated into complex systems where they can be hard-wired to a master control device to be activated on demand. The units also feature built-in 12V DC regulated power supply with overvoltage protection to guarantee superior performance and reliability, heavy-duty weather and waterproof construction (IP-66 rated), tripod/mounting sockets and a lifetime warranty. Optional accessories include various mounting brackets and power supplies. AXTON IR Illuminators are made in the USA.