... 5.Remote is optional Detailed Description:Product Name: WATCHDOG D1616F Biometric fingerprint Lock Color: Champagne Golden, Coffee, Vivid Black and Silver. ... metal doors and burglarproof doorUnlock Methods:by Mifare-1 card, Fingerprint, Password, Remote Control, long-distance Phone/Mobile, Mobile Message ... .www.jielimetal.com.cnTwo optional cylinders for your choice: Biometric fingerprint Lock D1616F