feature: 1. Don't worry about losing the key, your finger is your key, bringing convenience to your life. 2. Easy to operate, can store up to 20 fingerprints, and manage directly in the smart lock. 3. Built-in rechargeable lithium battery can charge the USB charger. 4. Unlock for 0.03 seconds, and then quickly identify the biometric identification lock to quickly delete fingerprints. 5. Can be widely used as backpack locks, luggage locks, locks on lockers, etc.