A 12V POE switch supplies 12 volts to devices equipped with the POE function such as wireless access points and sensors. In a single family home automation system, a 12V POE switch enables powering of multiple battery free sensors like door and window sensors. Using a 12V POE switch, the installation work is greatly simplified because power and data can be transmitted through one cable, which is an Ethernet cable. In addition, this lower voltage is beneficial for some domestic or low power consuming applications.