Simple and convenient installation, you can directly replace the existing handle.Can adapt to oblique tongue lock body or European standard mortise lock body on the market.The handle can be used regardless of left or right.Applicable door thickness 38-58mm4 AAA batteries, can last for about 1 year.The APP is powerful and the interface is simple:1: Email login, or Google, Facebook, WeChat quick login2: Smooth pairing and simple operation3: One key to unlock4: Historical record query5: Ordinary handle setting6: Invite users remotely7: Enter fingerprint8: Set password9: Obtain the one-day door opening password remotely10: APP password protection11: Multi-language selection (14 languages)Opening Method:1: Open the Bluetooth App2: Fingerprint unlock (128 fingerprints)3: Open the Create password4: Remote automatic generation of one-day password start5: The lock key is opened