This is an IC tag in the form of a key holder. Registration and unlocking have been confirmed to work without issue with SASEME Touch Pro and SASEME Face Pro. I purchased these to use with my Sesame Touch Pro and Sesame Face Pro at home, and I am selling the extras. Compatibility with other devices has not been confirmed. The specifications are as follows (copied from the information at the time of purchase): Chip Model: UID Chip Chip Usage: Rewritable, Readable, Copyable, Writable Storage Capacity: 1KB Operating Frequency: 13.56MHz Operating Temperature: -20°C to +85°C Readable Times: > 10000 times Detection Distance: 0-10cm Communication Speed: 106Kboud Packaging Material: ABS Power Supply Mode: Passive Card Lifespan: Over 10 years Read/Write Time: 1ms Production Standards: ISO 14443, ISO 10536 Weight: 8g