USB to ESP8266 ESP-01 Adapter:
Logic level: 3.3V
USB to serial TTL chip: CH340G
Selectable working mode: On-board toggle switch.
Working current: 300mA(LDO regulator can supply)
Working voltage: 4.5V - 5.5V (On-board 3.3v LDO Regulator)
1x CH340 USB to ESP8266 ESP-01 Adapter