Happymodel ExpressLRS ES900TX V2 915MHz 1W Transmitter Module

Happymodel ExpressLRS ES900TX V2 915MHz 1W is a high-power transmitter module based on ExpressLRS, providing ultra-long range, low latency, and stable performance even in demanding conditions.

Operating in the 915 MHz band, it offers better signal penetration and longer range compared to 2.4 GHz, making it ideal for long-range FPV flights.

The 1W output power (up to ~30–33 dBm) ensures a strong and stable link over long distances. At high power levels, the module uses a heatsink and active cooling (fan) for reliable operation.

It supports plug-and-play installation with popular transmitters such as Radiomaster and Jumper, making integration easy.

Built on the ExpressLRS ecosystem, it delivers low latency, high packet rates, and reliable telemetry, which are critical for FPV applications.

Key Specifications:

• Model: Happymodel ES900TX V2

• Frequency: 915 MHz

• Protocol: ExpressLRS (ELRS)

• Output Power: up to 1W (~30–33 dBm)

• Chipset: ESP32 + SX127x / SX128x (revision dependent)

• Interface: JR module bay

• Input Voltage: 5–13 V (recommended 5–9 V)

• Cooling: heatsink + fan

• Antenna Connector: SMA

• Dimensions: ≈ 55 × 39 × 11 mm

• Weight: ≈ 23 g (without antenna)

• Compatibility: Radiomaster, Jumper and other OpenTX/EdgeTX radios

• Firmware Update: Wi-Fi / UART