Features: Brand new and high quality Extending USB to 8CH TTL (UART) with hardware flow control, allows concurrents and independent communication for each channel. Onboards self-recovery protections, ensures current/voltages stable outputs, provide over-current/over-voltages proof, improve shockproofs performances. Onboards (voltages Suppressor), effectively suppresses voltages in circuit, protections. Onboards voltages translators circuit, with suppress and protections, safe and stable communications.Onboards TTL port 3.3V and 5V voltages level switches, allows selecting TTL level. enclosure with oxidation dull surfaces, process opening, wellcrafted. 4 LED for indicating power and transceiver status. Specifications: Component: Aluminum Package Includes: 1PC USB TO 8CH TTL Converters note: Please allow 0.5-1cm error due to manual measurement. please make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.