This proximity card reader is a perfect access control device for inside doors in any sensitive area. Maximum distance is approx. 15cm (5.9 inches). Constructed of tough ABS plastic. 12 character numeric keypad 1 red/green LED Buzzer 11 sets of time codes Up to 120 holiday schedules Keypad will lock for 30 seconds after continuous error operation Built-in watchdog to prevent system halting Support delay relay auto-relock function RS-485 support for networking (via controller or directly) Built-in reader and additional reader support port for exit or anti-pass-back function Control mode, card capacity and card type assignable by user directly RF Frequency / Reading range 125 kHz / 10-18cm Networking: RS-485, 9600, N, 8, 1 External reader port: Suitable for all WG, ABA reader, 125K, 13.56M (Mifare) or 2.4G reader Door relay: 12VDC @ 2A NO/NC/COM 0.1-60 sec. latch type Alarm relay: transistor output/serial output (selective) DI input: Egress button / door sensor / card sensor Tamper switch Serial port: limit switch (form C) Made of ABS plastic Dimensions: 112mm x 76mm x 25mm (4.41″ x 2.99″ x .98″)