Features: 1. Padlock without Charging: Utilizes 2-way communication technology with reverse power supply from cell phones to open the lock. After opening, keep the phone near the lock for 2-3 seconds to ensure sufficient power supply and prevent failure to close. The lock function can be disabled via the app. 2. Remote Authorization to Open the Lock: When someone needs access, you can remotely authorize them to open the lock. Add users through the app and manage permissions anytime, anywhere. 3. Tap-to-Unlock Functionality: Simplifies locking operations. Supports NFC bracelet unlocking and smartphone access via the app. Authorize and use NFC bracelets for tap-to-open convenience. 4. Unlock Positioning Display: View real-time unlock records including time, user, and location. Track unlocking history directly through the smartphone app. 5. After-Sales Service: If you have any questions, please contact us immediately and we will assist you as soon as possible. Specifications: Material: ABS+PC Buckle Material: SUS 304 Compatible Models: NFC-enabled smartphones Power Source: Smartphone NFC reverse power supply Water Resistance: IP55 Android Version: 9.0 or later Protection Level: IP22 Unlocking Methods: App, NFC Dimensions: 72 x 40 x 18 mm Usage Scenarios: Suitable for personal luggage, dormitory lockers, factory sites, hotel offices, indoor doors, gyms, etc. Package Includes: 1 x Lock 1 x User Manual