Description Can be used for serial interface software downloading, programming, etc. Three status LED, pwr, tx and rx TTL level selectable: 3v3 or 5V. Support up to windows 8 Documentation on this page. Note: Only 5V can be used to power external target device, 3V3 only used for TTL. Buck order price $0.8 for more than 50pcs order, price will automatically updated in the cart page.
