【Versatile Security Solution】This fingerprint lock with chain is designed for multiple applications including windows, refrigerators, doors, cabinets, washing machines, and file cabinets, offering flexible installation options (no drilling/drilling) to meet diverse home and office security needs. 【Advanced Biometric Technology】Utilizing semiconductor biometric recognition, this lock rejects fake fingerprints and provides 1-second identification for keyless unlocking, enhancing security and convenience. 【Durable Construction】Featuring a reinforced aluminum alloy chain, the lock is built to withstand external forces, ensuring robust protection for your belongings. 【Long-lasting Battery Life】With a low power consumption design, the lock can operate for approximately 10 months with 5 daily uses. The USB-C fast charging feature allows for immediate use upon charging. 【Electronic Key Functionality】Comes with an electronic key for easy fingerprint setup, addition of new fingerprints, and factory reset options, providing flexible management of up to 20 fingerprints. Specifications: Material: ABS + Aluminum Alloy Chain Length: 24.5cm Maximum Gap: 17.5cm Operating Voltage: 3.5V-4.2V Fingerprint Capacity: Up to 20 fingerprints Charging Port: USB-C Battery Life: Approximately 10 months (with 5 daily uses) Installation Options: No-drill or drill installation Recognition Speed: 1 second