... 3.3v logic level VCC,GND,TXD,RXD sampling workable Bluetooth TTL module3.3v logic levelVCC,GND,TXD,RXDAbout Sinforcon Sinforcon ... , RJ45 cables, USB RS422 cables, USB Parallel cables, USB to Audio cable. The chips are availavble for PL2303, CP2102, FT232RL, ZT213 ...