Happymodel ExpressLRS ELRS ES900TX 915MHz Ultra Long Range Transmitter Module and ES900RX 0.6g Receiver for Radiomaster TX16S Jumper T12 T16 T18 Transmitter Precise details: -Notice: 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+ESP8285 Dimension: 55mm*39mm*11mm Weight: 9.2gram (only the TX module) Antenna connector: SMA VCC input: 5~13v, Recommend 5v~9v RF Frequency optional: 915mhz or 868mhz(EU) Maximum Output Power: 27dBm operation, we recommend add a fan for force cooling) Wifi update firmware function for ES900TX would be available in a short time. --ES900RX: MCU: ESP8285 VCC input: 5v Operation current: ~100Ma Rx To FC protocol: CRSF RF Frequency optional: 915mhz or 868mhz(EU) Dimension: 12mm*12mm*3mm Weight: 0.60 gram (exclude antenna) Antenna connector: IPEX1 Telemetry output Power: