Technical Specification:Read Range: 2~22CM Keypad: 16 Key Numeric Keypad with Back Lighting Power: 2A/5VDC Card Encoding: Compatible with PSK type of 125 KHZOperating system: Linux Hardware platform: ZEM300 Register capacity: 30000/50000 Record capacity: 50000/80000Identification Time: <=20ms LCD: Character LCD 128×64 Operating Humidity: 20%-80% Language: English; Chinese; OthersSize: 180×125×55mm Operating Temperature:-20C-70C Communications: TCP/IP; RS485; RS232 LED Indicator: 2 Arry LED Indicators (Red, Green ) Standard Function: Work code, function key, scheduler bell Optional: HID Card, Mifare Card, backup power supply, Modem, Printer.