Specifications: Output format is default 10 bit 10 binary (4 byte). U disk shaped RFID card reader, easy to use, support for Android and for Windows. Type: USB RFID Reader Material: ABS Shell Working Frequency: 125KHz Card Type: TK4001, EM4100 and Other ID Cards Card Reading Time: less than 100ms Card Reading Distance: 0mm - 80mm/0" - 0.31" (Approx.) Voltage/Current: 5V/100mA Card Reading Speed: 0.2s Card Spacing: 0.5s Communication Interface: USB Working Temperature: -20°C -70°C Operating System: for Windows XP/CE/VISTA/7/10, for Linux, for Android Features: USB Interface, RFID Card Reader, Quick Reading Size: 75mm x 21mm x 7mm/2.95" x 0.83" x 0.28" (Approx.) Notes: For mobile phone use, you need use an OTG adapter, and it is not included in the package. Due to the light and screen setting difference, the itemand 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x USB RFID Reader (Others are not included.) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.