Model DOT1A5 DOT2A4 Display Module 5*7 Dot Matrix Module 5*7 Dot Matrix Module Data Receive Serial RS232C/RS485 (ASCII DATA) 8Bit Data Parallel Multiplexed 4 bit Enable Display Controller Build in Option Maximum Digit Display 5 Digits 4 Digits Maximum Character to program 20 Character Depend on user How to Program Computer Depend on Controller Multiple Display Units. 8 Addressing Unit Depend on Controller Model of Dot Display Dot1 Dot2 Display Color Red Red Installation Wall Type Control Panel Dimension (W*L*H) mm. 230*600*155 90*80*100 Power Supply 220Vac. / 2A 24Vdc. / 2A.