Abstract: A security device, such as a passive infra-red motion detector (1) is provided with a plurality of fasteners (15, 25). One fastener (25) removably fastens a lens (4) to a housing of the passive infra-red detector, such that the lens (4) can be removed from the outside of the housing, whilst the other fastener (15) fastens a front section (2) of the housing to the rear section (3). Both fasteners (15, 25) are transparent/translucent and act as light guides.

Abstract: A wireless mesh network comprises a controller and a plurality of wireless networked devices arranged to transmit messages to and receive messages from the controller. The plurality of devices are arranged in zones, such that a device that is arranged to communicate directly with the controller is designated a “Zone 1” device and a device that is arranged to communicate with the controller via a “Zone 1” device is designated a “Zone 2” device. One or more or each of the plurality of devices periodically sends a positioning message to the controller to determine its zone and if it can communicate directly with the controller it determines that it is a “Zone 1” device and if it cannot communicate directly with the controller, but it can communicate with the controller via a “Zone 1” device and therefore arranged to do so, it determines that it is a “Zone 2” device.

Abstract: A wireless mesh network comprises a controller and a plurality of wireless networked devices arranged to transmit messages to and receive messages from the controller. The plurality of devices are arranged in zones, such that a device that is arranged to communicate directly with the controller is designated a “Zone 1” device and a device that is arranged to communicate with the controller via a “Zone 1” device is designated a “Zone 2” device. One or more or each of the plurality of devices periodically sends a positioning message to the controller to determine its zone and if it can communicate directly with the controller it determines that it is a “Zone 1” device and if it cannot communicate directly with the controller, but it can communicate with the controller via a “Zone 1” device and therefore arranged to do so, it determines that it is a “Zone 2” device.

Abstract: A method of transmitting electronic signals for use with a wireless network arrangement comprising assimilating and storing data relating to successful communication routes within the network arrangement and the transmission and receiving of electronic signals between the minimum number of devices in wireless network arrangement to improve efficiency of data communication and to reduce the power consumption of the network.

Abstract: A method of transmitting electronic signals for use with a wireless network arrangement comprising assimilating and storing data relating to successful communication routes within the network arrangement and the transmission and receiving of electronic signals between the minimum number of devices in wireless network arrangement to imp v efficiency of data communication and to reduce the power consumption of the network.