The 4th Gen Outdoor Smart Padlock from eGeeTouch features a short shackle and is controlled by the included Intelligent Access Management (IAM) software compatible with iOS and Android (subscription is sold separately). The lock is designed for commercial, industrial, and government applications and is waterproof, freeze-proof, and corrosion-resistant. To open it, you can press the shackle and tap on the padlock with an eGeeTouch NFC tag, with any Bluetooth-paired iOS/Android smartphone, or with an Apple Watch or Samsung Gear S2/3 watch.
The IAM application allows an administrator to set, deny, or restrict access to specific authorized persons depending on the time period of the day/week, date, and frequencies of access. There's also a useful feature for commercial sharing access.