Bluetooth smart padlock solutions, the recently released networking solutions for small padlocks and U-locks, can be used to replace traditional electronic padlock solutions that do not feature networking capabilities at comparable costs. By supporting the pairing of padlocks with the app through Bluetooth, the smart solutions enable padlocks easier to operate and help manufacturers to optimize users' interactive experience with their padlocks and reduce product education and after-sales costs. Unlike traditional electronic padlocks, smart Bluetooth padlocks can implement online over-the-air (OTA) upgrades.