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This passive smart padlock utilises smart key power supply technology (no batteries required inside the lock body) and features a built-in passive electronic lock cylinder, enabling continuous operation. It supports unlocking via three modes—Bluetooth, NB-IoT and electronic key—and facilitates an efficient ‘one key to manage a thousand locks’ management system. It operates reliably in extreme temperatures ranging from –10 °C to 60 °C and complies with the IP66 waterproof standard, thereby eliminating the need for battery replacement and emergency maintenance commonly associated with traditional locks.