[Material Quality] Call point test key is made of plastic, can one step installation in place, and the size of 2.28inches.[Package Includes] 4 black keys, 4 white keys for call points. High durability and long service life.[Safe Fire Alarm Testing] Users can perform fire alarm testing without breaking the glass. Allows the user to test the call point, or reset the call point upon activation, provided it has a resettable element.[Fits a Variety of Call Points] Compatible with KAC, ADT, Apollo, Morely, Chubb, Hochiki, Nittan, Notifier, Protect, System Sensor and Ziton.[Advantage] Perfect for security guards, maintenance personnel, and those looking after a building or property. Allowing clear identification of the call point key for convenient future use. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.