Adopt DB9 serial port, run TX, RX, VCC, GND pins, convenient to connect with dupont cable. Working Voltage:3.3V-5.5V, RX/TX logic level is equivalent to VCC power. Can be used to program STC SCM, STM32 SCM, NXP SCM, Renesas SCM, NEC SCM. Widely used for Radio Refit, Mobile Root, XBOX360 Root, GPS, Vehicle Inspection and Repair, DVD Root, Hard Drive Repair, Set Top Box Upgrade etc. Suitable for all types of DB9 serial to TTL communication required for situations or electronic projects.