ITEM NAME:MAX3232 RS232 Serial Port To TTL Converter Module Female DB9 COM Serial MAX23 Bj Specification: Control chip: MAX3232 Operating voltage: 3.3V-5V DC Operating Current: 6MA Power supply: external Interface: TXD, RXD, GND, VCC Dimensions: 33mm*32mm*16mm Package Included: 1  x  MAX3232 RS232 to TTL Serial Port Converter Module DB9 Connector MAX232.Interface: TXD, RXD, GND, VCC.