The new TCXO version EP series receivers apply a “temperature compensated crystal oscillator”, for accurate frequency and excellent performance in extreme temperature environments.

EP1 Dual TCXO Receiver
Type: ISM2.4GHz
ESP32 PICO D4, dual SX1280(SX1281)
Antenna connector: IPEX MHF 1/U.FL
RF Frequency: 2.4GHz (2400~2480MHz)
Telemetry power: >19dbm
Receiver protocol: CRSF
Input voltage: 3.5~5V Recommend +5V DC @ “+” pad
PCB size: 19mm x 14mm
Weight: 1gram exclude antenna
Built-in a TCXO (temperature compensated crystal oscillator)
Default Firmware out of factory: Unified_ESP32_2400_RX  Could upgrade to HappyModel EP1 Dual 2400 RX 3.0 FW