The Smart Life K21 Smart Lock is a fantastic choice for enhancing home security with its versatile features and robust design. 
 
Multiple Unlocking Methods: It supports fingerprint scanning, traditional keys, passwords, cards, and app access via the Tuya app, which is compatible with both iOS and Android devices.
Durability: Designed to operate in a wide temperature range (-20 to 65 ℃) and withstand humidity levels from 10% to 90%.
Battery Life: Impressive battery life, supporting up to 12,000 uses, which translates to over 18 months of operation on a single lithium battery.
Design: Available in Dark Gray and Rose Gold, it integrates seamlessly with standard doors with dimensions of 72mm by 418mm.
Given your interest in smart locks with biometric features, app connectivity, and environmental durability.