Product Description : Nulsom Inc. Ultra Compact Rs232 To Ttl Converter With Male Db9 (3.3V To 5V) This Adapter Helps To Convert Ttl (Transistor-Transistor Logic) Level Signals To Rs-232 Interface This Converter Has A Male Db9 Connector Suitable For Use With Most Microcontrollers, 300 To 115,200 Bps (Up To 230,400 Bps) Please Consider Ns-Trs232-02 (Asin: B074Bmlm11) For High-Speed Rs232 Communication (Up To 1Mbps) ] Compatible With Arduino, Raspberry Pi, And Any Micro Controller, Such As Pic, Atmel, Stm Or Other System With Ttl Serial Communications Operate With 3V To 55V Power Supply You Can Use This On Both Your 33V And 5V Projects For 18V Projects Please Consider Ns-Trs232-02 (Asin: B074Bmlm11) ] Perfect For Any Rs232 To Ttl Electronic Projects The Operating Temperature Range: -40Ac To +85Ac Ns-Rs232-02 (Male Type)Rts (Board) > T2In (Sp3232Eey) T2Out > Pin 7 (Male Db-9 Connector) Cts (Board) R2Out (Sp3232Eey) R2In Pin 8 (Male Db-9 Connector) Please Disconnect This Module While Uploading As This Is Shared With Arduinos Digital Pins 0 And 1 For The Serial Communication This Can Be Connected And Used After The Sketch Code Has Been Uploaded California Prop 65 Warning : This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information visit to the website.