Door lock with fingerprint and WIFI application7 ways to unlock.FINGER PRINT , KEYPAD , NFC CARD , MECHANICAL KEY , EMERGENCY POWER +  WIFI APPSmart door lock for bed Room RDL-22Power supply: 4.5v-6.5v (i.e. 4 dry batteries)No Need for Wiring Replace existing LockMobile App: Smart Life, Tuya