HZC Electric S901D-ZG Zigbee Contact Door / Window Sensor Bought for a project and was never installed, only used for testing and evaluation purposes. Decent quality basic contact door / window sensor, features contact open / close as well as tamper. Main sensor has mounting plate to allow for easy future battery changes. Using Zigbee IAS Cluster so should work with most Zigbee controllers using any "generic" Zigbee contact sensor device driver. Using your favourite search engine, please check compatibility with your Zigbee controller and system prior to purchase! See my other eBay items at https://www.ebay.co.uk/usr/verenceasafool for more Smart Home devices and gadgets. Photos are of actual item - you will receive exactly what is shown in the photos, nothing more, nothing less. Please ensure that you are happy with this description and the photos of the item, if anything is unclear feel free to ask before purchasing. Priced now for a quick sale so grab a bargain!