This listing is for a reproduction of the back for a Honeywell 5800PIR-RES Wireless Passive Infrared Motion Sensor - May fit other models as well! These pieces are produced using 3D printing technology and have been tested to fit the 5800PIR sensor. They're made using a durable white PETG plastic. These are aftermarket replacements - NOT OEM - This product is not affiliated with the honeywell brand and respective sub-companies