We have seen plenty of cool smart padlocks in the past few years. The 360LOCK is a smart padlock that you can lock/unlock from your iOS or Android device or using RFID/NFC wristband/tag. More importantly, it has Blockkchain integration, so hackers will have a harder time cracking it.
The 360LOCK is waterproof and dustproof. Its battery lasts for 1000 openings and closings. Expected to ship in November.