Happymodel ExpressLRS ELRS ES900TX 915MHz Ultra Long Range Transmitter Module and ES900RX 0 6g Receiver for Radiomaster TX16S Jumper T12 T16 T18 TransmitterNotice Since November 24 2021 Out of stock orders ES900TX and ES900TX RX combo are all fully assembled before shipped out of factory Out of stock orders will be shipped according to the new ES900TX and ES900RX 915MHz The New version ExpressLRS hardware 868MHz 900MHz TX and RX module ES900TX and ES900RX coming out which is instead ES915TX and ES915RX due to shortage of SMT32 chips OVERVIEW ES900TX and ES900RX modules are a set of Long Range 915MHz 868MHz optional wireless transmission equipment developed and designed based on the open source software ExpressLRS This set of modules is characterized by ultra long range stable operation and low latency The module is compatible with most Opentx remote controllers especially suitable for Radiomaster TX16S and Jumper T12 T16 T18 series remote controllers basically plug and play We have specially customized the heat sink for the transmitter module and also reserve the installation position of the 2006 fan which can help the transmitter module to operate stably under high power conditions New ES900TX module coming with a 2006 Fan it would working automatically when the TX power is 250mw Specifications ES900TX MCU ESP32 ESP8285Dimension 55mm 39mm 11mmWeight 9 2gram only the TX module Antenna connector SMAVCC input 5 13v Recommend 5v 9vRF Frequency optional 915mhz