antenna
RF Frequency: 2.4GHz ISM
Telemetry power: 20dbm
AT2401C Rx_gain: 12dB
Receiver protocol: CRSF
Input voltage: 4~9V DC @ 5V pad
Power dissipation: 40~45mA(before binding), 60~65mA(binding), 90~95mA(wifi mode)
PCB size: 21mm x 15mm
Weight: 1.2g
Packing: 1x ELRS-R24-S
Firmwares

ExpressLRS MATEK_2400_RX
Firmware update via UART or WIFI
ELRS-R24-S: disable USE_DIVERSITY (unchecked) when flashing in ExpressLRS configurator

Any ELRS 2.4Ghz receivers can work with any ELRS 2.4Ghz TX Modules, from any manufacturer and even the DIY ones. This is as long as they have the same binding phrase and configuration options (Regulatory Domain, Performance Options and Extra Data).

More details about ExpressLRS, pls check out ExpressLRS wiki

Wiring with FC
Receiver RX FC UART_TX for Telemetry
Receiver TX FC UART_RX for Control
Receiver 5V FC 5V or 4v5
Receiver G FC GND
Receiver protocol: Serial-based receiver CRSF

Traditional Binding
Receivers have ExpressLRS fw V1.1.0 preloaded without BINDING_PHRASE
Power on and off your receiver three times
Make sure the LED is doing a quick double blink, which indicates the receiver is in bind mode
Use the [BIND] button on the Transmitter Lua script, which sends out a binding pulse
Receiver will switch to slow blink once it has received binding pulse.
Power off and power on receiver again. If the receiver LED switch to solid on from slow blink, its bound with your transmitter.
Important: If the RX firmware has a bind phrase, the RX will never enter binding mode using the above procedure. It must be flashed without a binding phrase to do traditional binding.