Key Points: With ENER-Js fingerprint unlock design you dont have to worry about losing your keys or forgetting password. Through Capacities Touch Sensor, our smart padlock can identify your fingerprint accurately. Supports up to 16 groups of fingerprints. We select ADC12 Aluminum Alloy and Type 303 Stainless Steel as material, which has excellent strength and will never rust. Great security performance will protect your cabinet and home against thieves. Using QR Code provided in package to download free APP (for Android and iOS), one can then enjoy convenient key less design and share access with friends, family. Battery display of APP can remind you to charge it on time. Can be easily charged by USB cable (micro USB port on bottom). By one full charge, the built-in battery can keep standby for one month or 1000 times unlock. IP65 waterproof function can withstand ordinary wet environments and rainy weather. Perfect for outdoor and indoor use, such as suitcases, cabinets, bicycle, backpacks, school lockers, etc. Main Features Material: ADC12 Aluminum Alloy + 304 Stainless Steel BT Version: 4.0 BT Working Frequency: 2.4G System Requirement for iOS/Android: 4.3 and above Battery: built-in 1 * 3.7V 130mAh 501225 polymer battery Working Voltage: 3.7V Service Time: about 1 month standby time Unlock Times: over 1000 continuous unlock times Unlock Record: 1000pcs Fingerprint: 16 groups Charging Method: Micro USB, 5V 130mA (USB cable is not included) Waterproof Grade: IP65 Work Environment: Temperature: -25~80°C; Humidity: 5%~95% Lock Size: 7.8 * 5 * 2.3cm Lock Weight: 105g / 3.7oz Package Size: 12.1 * 8.4 * 3.5cm / 4.8 * 3.3 * 1.4in Package Weight: 160g / 5.6oz Bluetooth parameters Bluetooth chip: TI-CC2541 Working frequency band: 2.4G Receive sensitivity: -90dbm Transmit power: -8.5dbm Secure encryption: AES encryption Bluetooth version: 4.0 BLE Support 360° discrimination function Support fingerprint stitching function