PSM09 is only for indoor using device. PSM09 can detect the the door is open or not. The Recessed door sensor PSM09 is Base on Z-WaveTM technology. It is the Z-WaveTM plus product, it support the security, OTA. Those newest features of the Z-WaveTM technology. Z-WaveTM is a wireless communication protocol designed for home automation, specifically to remotely control applications in residential and light commercial environments. The technology uses a low-power RF radio embedded or retrofitted into home electronics devices and systems, such as lighting, home access control, entertainment systems and household appliances. Notice: if user use some command, it have to check device is security bootstrap otherwise some command cannot increment. This device is a security enabled Z-Wave Plus product that is able to use encrypted Z-Wave Plus messages to communicate to other security enabled Z-Wave Plus products. This device must be used in conjunction with a Security Enabled Z-Wave Controller in order to fully utilize all implemented functions. This product can be operated in any Z-Wave network with other Z-Wave certified devices from other manufacturers. All non-battery operated nodes within the network will act as repeaters regardless of vendor to increase reliability of the network.