Power:5mA (typical) standby 90mA (typical) field scanning 5V (typical) operation Comply with 11784/85 protocol:Supports TK4100, GK4100, EM4100 and compatible chipSupports TEMIC 5557, ATA5567 and ATA5577Supports secondary developmentPhysical interface:USB 2.0RS 232 RFID antenna: built-inFrequency: 125 to 134.2kHz (LF)Operating system:Microsoft's Windows 2000/XP/Vista/7 LinuxRead/write distance: 3 to 10cm (depending on antenna structure and user environment)With 3 colored LEDBuilt-in buzzerDevelopment environment: C++, VC, Java, C #, Vb, Vb.Net and DelphiApplications:Bars, KTV and restaurantHotel access, water/electric/gas power card issuers and rechargeID card key backupAnimal managementDimension: 123 x 88 x 25mm Weight: about 100g