Feature: 1. Fingerprint lock, adopts high‑quality zinc alloy material with good durability and stability. 2. The fingerprint collector uses a semiconductor living fingerprint sensor with high security. 3. Fast fingerprint recognition speed, simple operation, and the lock can be quickly unlocked by pressing the fingerprint lightly. 4. With USB charging interface, built‑in 3.7V rechargeable lithium battery, can be charged via data cable and power bank. 5. After each unlock, the pass rate will be continuously improved through fingerprint stitching and image recognition learning algorithms. Specification: Item Type: Lock Material: Zinc Alloy Battery Type: 3.7V Lithium Battery Battery Model: 402025 Nominal Battery Capacity: 150mAh Number of Fingerprints Can be Stored: 20 Rejection Rate: <2% Application: Cabinet Doors, Drawers, etc. Weight: Approx. 184g / 6.5oz Size: Approx. 4x4x5cm / 1.6x1.6x2.0in. Package List: 1 x Lock1 x For Android Data Line6 x Screw1 x Aluminium Alloy Accessory1 x Manual Note: 1.Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.