50 Ultralight C ULC keyfobs NFC keyfobs RFID token fobs, MF0ICU2 gray RFID keychains, compatible with most newly upgraded door locks on the market

["Each package contains 50 gray ultra light C RFID keyfobs. The size is 40mm x 30mm x 4mm. Comes with a metal ring for easy hanging and carrying, compact and space saving.","These ULC keyfobs are made of ABS material, which is lightweight, waterproof, drop resistant, heat-resistant, and has a long service life. However, please note that prolonged exposure to high temperatures (>60 ℃) or high humidity environments may result in chip failure and prevent normal use.","This ULC keyfob can be used for most access control systems, but please note that it is not compatible with AMIIBO and 125kHz card readers.","This keyfob uses the Ultralight C MFOICU2 chip, with a working frequency of 13.56Hz and available memory of 192 bytes. Each keyfob has a unique 7-byte serial number and supports anti cloning.","All of our products have undergone strict testing. If you encounter any quality issues or other questions, please feel free to contact us and we will do our best to solve your problem."]