The CMO 2000Wi-Fi Safety edge come in 2 metre lengths with a built in Wi-Fi Transmitter thatis powered by 3 AA batteries, and is ideal for a quick and tidy installation. Noneed for running cables as the CMO 2000 Wi-Fi Safety edge connects wirelesslyto your gate automaton via the Master Wi-Fi SO receiver (sold separately). Thesafety edge can be cut to size depending on the height of your gate. And are AEN13849-2:2008 certified safety device that also acts as Class 2 protectionwhen connected to Master Wi-Fi SO receiver. You can connect a maximum of 6 Wi-Fi devices to the receiver and achievea maximum distance of 20 metres between the receiver and the CMO 2000 Wi-Fi Safety edges.