The EVVA AirKey Open Shackle Padlock is reliable and secure with a hardened steel shackle. It is easy to install and can be retrospectively integrated into existing AirKey locking systems. The padlock can be unlocked by using your NFC-compatible smartphone (Android or iPhone), where keys can be easily sent using SMS text messages with push notification alerts, bluetooth, and also Evva AirKey key cards. It is rated to IP65 meaning that it is suitable for both indoor and outdoor use with a working temperature between -20°C and +55°C. The padlock is CE certified and is supplied with 2 x CR2 batteries which provide long life for up to 30,000 cycles and are easily replaceable.