Optimized for long-distance control: This for ELRS module set is equipped with an ES900TX transmitter and is designed for model aircraft enthusiasts who are looking to achieve excellent long-distance performance Powerful signal: It operates at a frequency of 915MHz, which ensures strong signal strength and reliability at long distances Cooling fan: The for version ES900TX adds a 2006 cooling fan, which can help the transmitter module operate stably under high power state. The fan is plug-and-play and automatically works when the transmitter module power is set to 250mw Enhanced compatibility: This module combination is suitable for a variety of model aircraft and can be seamlessly integrated with settings, enhancing your control experience without worrying about compatibility issues and reliable: Made of high-quality materials, it can withstand rigorous use in environmental conditions, ensuring and stable performance Antenna terminal: SMA Input power: 5-13v, recommended 5v-9v Operating frequency range: 915MHz Maximum output power: Less than 33dBm Colour:As Shown Material:ABS Package Contents: 1 x ELRS 915MHz Module Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.