1. -compliant. PC/-compliant. Read/write to 424 kbps2. Built-in antenna for contactless tag access, with card reading distance of up to 50 mm (depending on tag type)3. Supports 14443 Type A and B, FeliCa, and all 4 types of NFC (/IEC 18092) tags4. Supports new IC Ultralight C (via APDUs) and IC Plus SL1 (4 UID, via APDUS) and SL35. Supports all 3 modes of NFC: reader, card emulation and -to- modes. Built-in anti-collision feature (at least 1 card is detected when multiple cards are presented). -controllable bi-color LEDSize: 98(L) x 65(W) x 12.8mm (H)Interface: USB Full SpeedOperating distance: up to 50mm (depends on tag type)Supply voltage: Regulated 5 V DCWorking current: 200mAStandby current: 50mANormal current: 100mAOperating Frequency: 13.56 MHzSmart Card Interface Support: for ISO14443 Type A & B, Mi-, FeliCa, 4 types of NFC ( / IEC18092) tagsSupport OS: 98 Win, Win , Win 2000, Win XP, Win Vista, Win 7, Windows Server 2003, Windows Server 2008,Windows XP x64, Win Vista x64, Win 7x64, Win Server 2003x64, Win Server 2008x64, Win Server 2008 x64, Windows 5.0, Linux, Product ApplicationsNetwork access control-paymentNFC mobile tagPublic transportation terminalsAutomatic access controlCustomer loyaltyTime and attendanceContactless public phonesVending machinescolor:WhiteMaterial:ABSPackage Contents:1 x ACR12U reader writer1 x 5 x S50 MF card (not writable)5 x UID writable keyfobsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.