RS232 DB25 BREAK-OUT BOX TESTER RS-232 Break-Out-Box offers a complete control of RS-232 interface, test, re-wire and open signal lines. Batteryless, Pocket-sized for circuit testing, monitoring and patching. There are 10 interface signal powered LEDs to permanently monitor TD, RD, RTS, CTS, DSR, CD, TC, RC, DTR (E) TC and two LEDs for spare. 24 switches enable to break out circuit or reconfigure and patch any or all of 24 active positions. This unit has one DB25 male and one DB25 female RS-232 connectors.