Makerfocus 4pcs ESP8266 ESP-01S WiFi Serial Transceiver Module with 1MB Flash for Arduino<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Latest version esp-01s，comparing to ESP-01， ESP-01S will provide you stronger antenna singna </span></li><li><span class="a-list-item"> 1MB Flash Memory. upgraded from 512KB </span></li><li><span class="a-list-item"> Integrated WEP， TKIP， AES， and WAPI engines. 802.11 b/g/n </span></li><li><span class="a-list-item"> Wake up and transmit packets in 2ms. Standby power consumption of 1.0mW (DTIM3) </span></li><li><span class="a-list-item"> Document link: https://nurdspace.nl/ESP8266 </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51TxGfM3RPL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51AesQIjOCL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41KAmyWVbpL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51ihCu9BrtL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41Q9jqDEynL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41Pps2RTX%2BL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51NDANYHOjL.jpg" noproxy>