1. Compatible with most of 125KHz RFID cards. Support EM4100 ID card, 5200 Card, AWID card, EM4305 card, T5577 card, and some type of HID card. NOT support 13.56MHz IC Card or UHF, UID card, HID iCIass, HID Pr0xCard II, HID Pr0xKey III. | 2. Smart phone size, comfortable hand feeling. Working with 2pcs AAA batteries, easy to use and carry. | 3. Built-in buzzer and LED. Reading distance is 0-6cm(0-2.4 inch). | 4. Widely used at home, community, school, office, hotel, elevator, and any other places need security surveillance or access control support. | 5. NOTE: The applicability of our reader is limited, it cannot match all types of FRID cards. Please read our product description carefully. If your card is not the type listed by us, or if you don’t know the type of your card, please do not buy it, or you can consult me. Thanks!