Pack of 25. The EVVA AirKey Proximity Wristband Fob is designed for use with Evva AirKey Cylinders and provides convenient keyless access for your electronic locking system. With a PC/ABS body, the wristband is highly durable, with a comfortable strap with no allergens for ensured ease of use and wearability and is IP67 rated.. Suitable for use with Evva AirKey cylinders. Provides convenient keyless access. IP67 rated. Highly durable PC/ABS body