Keri's NXT-K Proximity key tag provides user convenience in a small, ergonomic, and extremely durable package. The key fob is equipped with a brass eyelet for attachment to a key ring that ensures the neck of the tag will not break during the life of the system. Key fobs are especially convenient for building entrances where the user still has their car keys in hand. If the system has many interior doors that are secured with a Keri access control system, users often attach the tag to a necklace for easy carrying, especially if the clothing does not have pockets. If parking gates are secured by an access control system, a Keri Proximity Card is recommended because the key fob is usually hanging with the keys in the ignition. Uses 128-bit encryption between the key tag and the reader.