Product size 40MM*32MM*3.5MM Product color gray material ABS Frequency 13.56MHZ Adaptation scope: access control, presence, elevator, etc. Wide range of uses — This product can be used in all scenarios requiring a secure access control including access control, elevator keys and controllers. High Quality Materials — This product is made of high quality ABS quality, rust-proof and wear-resistant, which can give you a good touch feeling. Due to the different shooting lights and monitors, please allow some color errors. Thank you for understanding.