PWM1 and GND to into Bootloader mode . 0 get PWM3->Rx?->Tx PWM?->Boot Connect PWM and G

EP1 TCXO Receiver

Type: ISM2.4GHz

ESP8285 MCU

SX1280(SX1281)IMLTRT RF Module

Omni directional antenna

Frequency Range: 2400 MHz to 2500 MHz

Receive refresh rate: 25HZ~500Hz

Working voltage: 5v

Weight: 0.41 gram(without antenna)

Dimension: 10mm*10mm*6mm

Peak gain: 2.23dB

Default Firmware out of factory: HappyModel_EP_2400_RX V2.2 version

Built-in a TCXO (temperature compensated crystal oscillator)

EP2 TCXO Receiver

Type: ISM2.4GHz

ESP8285 MCU

SX1280(SX1281)IMLTRT RF Module

SMD Ceramic antenna

Frequency Range: 2400 MHz to 2500 MHz

Receive refresh rate: 25HZ~500Hz

Working voltage: 5v

Weight: 0.44 gram

Dimension: 10mm*10mm*6mm

Peak gain: 3.7dB

Default Firmware out of factory: HappyModel_EP_2400_RX V2.2 version

Built-in a TCXO (temperature compensated crystal oscillator)

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: +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 3.0FW

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This HappyModel Express LRS ELRS 2.4G RX receiver is designed for long-range applications, featuring a nano-sized design with high sensitivity and excellent signal stability.