<p>The Happymodel 2.4GHz ELRS nano series receiver is an open source program based on ExpressLRS, we have 3 types rx module released.</p><p><br></p><p>The PP RX is designed by @Jye Smith from ExpressLRS development team. Its main hardware architecture is STM32L432KBU6 MCU and SX1280 RF chip. It has a built-in ceramic antenna, which is super light and small in size.</p><p><br></p><p>On the basis of PP RX, we have developed the Nano 2.4GHz rx of ESP8285 version named EP1 and EP2. &nbsp;The RF module of EP1/EP2 is the same like PP RX and use ESP8285 MCU . So you can upgrade firmware by WIFI , that’s too simple .</p><p><br></p><p>Due to the low-latency and high-refresh-rate RF module, they are very comfortable for FPV race and Long Range FPV. And very suitable for Tiny whoop because of the ultra light and Nano size.</p><p><br></p><p><br></p><table width="797" style="margin: 0px 0px 10px; padding: 0px; border-bottom-width: 1px; border-bottom-style: solid; border-color: rgba(51, 51, 51, 0.12); width: 825px; caret-color: rgb(133, 134, 140); color: rgb(133, 134, 140); font-family: Roboto, Helvetica, Arial, Verdana, sans-serif; font-size: 15px;"><tbody style="margin: 0px; padding: 0px;"><tr style="margin: 0px; padding: 0px;"><td width="179" style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12);"></td><td width="206" style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; font-weight: 700;">PP(w/ antenna)</span></td><td width="206" style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; font-weight: 700;">EP1(w/o antenna)</span></td><td width="206" style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; font-weight: 700;">EP2(w/ antenna)</span></td></tr><tr style="margin: 0px; padding: 0px;"><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; font-weight: 700;">MCU</span></td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; color: rgb(255, 0, 0);">STM32L432KBU6</span></td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">ESP8285</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">ESP8285</td></tr><tr style="margin: 0px; padding: 0px;"><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; font-weight: 700;">RF Chip</span></td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">SX1280IMLTRT</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">SX1280IMLTRT</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">SX1280IMLTRT</td></tr><tr style="margin: 0px; padding: 0px;"><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; font-weight: 700;">Antenna</span></td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">SMD Ceramic</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; color: rgb(255, 0, 0);">Omnidirectional</span></td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">SMD Ceramic</td></tr><tr style="margin: 0px; padding: 0px;"><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; font-weight: 700;">Dimension</span></td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">10mm*10mm*6mm</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">10mm*10mm*3mm</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">10mm*10mm*6mm</td></tr><tr style="margin: 0px; padding: 0px;"><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; font-weight: 700;">Weight</span></td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">0.47g</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">0.42g</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">0.44g</td></tr><tr style="margin: 0px; padding: 0px;"><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><a href="http://www.happymodel.cn/index.php/2021/04/10/elrs-rx-tx-firmware-for-happymodel-elrs-es24tx-pp_rx-ep1_rx-ep2_rx-stock-firmware-out-of-factory/" target="_blank" rel="noopener" style="margin: 0px; padding: 0px; text-decoration: underline; color: rgb(126, 60, 104);"><span style="margin: 0px; padding: 0px; font-weight: 700;">Firmware target</span></a></td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; color: rgb(255, 0, 0);">6cb8152d&nbsp;</span></td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">aec8ad82</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">aec8ad82</td></tr><tr style="margin: 0px; padding: 0px;"><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;"><span style="margin: 0px; padding: 0px; font-weight: 700;">Firmware upload</span></td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">Betaflight pass-through</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">Wifi</td><td style="margin: 0px; padding: 5px 10px 5px 5px; border-top-width: 1px; border-top-style: solid; border-color: rgba(51, 51, 51, 0.12); text-align: center;">Wifi</td></tr></tbody></table>