CH340 USB to TTL module transfer lines upgrade flash STC dow

1,onboard CH340 USB to RS232 interface conversion chip.

2,onboard power light.

3,onboard USB male head, convenient to connect the computer.

4,TTL chip pins has led to facilitate communication with microcomputer

5,working voltage: 5 v.

6,board size: 18.2 (mm) x15 (mm).