Solu HLK-RM04 wifi Module Serial to Ethernet wifi AP wireless routing module//Serial Uart to Ethernet Switch WIFI Module HLK-RM04 for Arduino Wireless//Serial Uart to Ethernet Switch WIFI Module HLK-RM04 for Arduino Wireless 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 This product ,embedded module, is based on the universal serial interface which accord with network standard, built-in TCP/IP protocol stack, can realize the user a serial port, Ethernet and wireless network (WIFI) any transparent conversion between the three interfaces. Through the HLK - RM04 module, traditional serial port devices in don't need to change any configuration, can through the Internet network transmit their own data. 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. Built-in 360M MIPS CPU, 16M RAM and 4M FLASH, wireless baseband and RF front-end and a variety of peripheral bus.A serial port equipment for users to transmit data through Ethernet provides quick resolution.