Solu Mini RS232 Max3232 to TTL Level Conversion Board, a Serial Port Transfer Board//Mini RS232 - TTL Converter Module Board Adapter MAX3232 120kbps 3-5V Serial Port About us (Solu), Professional factory of circuit boards, welcome to our store for more choices with best price. What we pursue is your satisfication of our service, not just for our goods.For any reason you are unsatisfied with our product at any time, simply contact support for exchange or refund. we will reply you about any question you ask within 24 hours Usually, you will get it actually in 9~19 days, If you are in the USA and the item is NOT Fulfilled by Amazon. the item will be sent to you by USPS with shipping information from China. The estimated delivery time offered by Amazon is not the real time. Your patience is highly appreciated. Hope you will receive your item soon and enjoy using it. Voltage range: 3 v to 5 v Chip: MAX3232CSE The highest baud rate : not recommended More than 120 KBPS Size: 9.4 mm*15.9 mm