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DSD TECH: DSD TECH focuses on the development of serial devices such as TTL/RS232/RS485. We have served more than 100,000 customers in total. Lead PIN: 3.3V ,5V,TXD,RXD,DSR,DTR,RTS,CTS. This adapter supports output voltages of 3.3V and 5V. But the logic level is 3.3V Protective case: Come with a protective case, this transparent protective case can effectively prevent static interference from the hand and prevent accidental short circuit. Compatibility: Works with Windows 10,8,7. What you get: 2 PCS USB to TTL Serial Adapter ,1 PCS 6 PIN DuPont cable, 12-month free Warranty, friendly Customer Service (24-hours prompt Reply).