Binding an ExpressLRS receiver takes a matching binding phrase on the radio module and the receiver. Set the phrase once, and the receiver binds on every power-up without a button press. This guide covers receiver choice, wiring, the phrase, and the checks that prove the link works.
What is a binding phrase?
A binding phrase is a short text string shared by the transmitter module and the receiver. Both sides must use the exact same phrase, character for character.
The phrase replaces the old bind-button method. An RP1 V2 receiver runs CRSF at 500 Hz once the phrase binds it.
Which ELRS receiver fits your build?
The RadioMaster RP1 V2 is a nano receiver on 2.4 GHz with a 65 mm antenna. It runs CRSF at 500 Hz and fits a 5-inch freestyle quad.
The RP3 adds diversity with two antennas for a stronger link. The HappyModel EP1 weighs 0.41 g and suits a small whoop.
How do you wire the receiver to the flight controller?
Wire the receiver to a free UART on the flight controller. Connect receiver TX to flight controller RX, and receiver RX to flight controller TX.
Power the receiver from a 5 V pad, since most ELRS receivers need 5 V. The RP2 V2 lists 5 V input and weighs 0.55 g.
How do you set the binding phrase?
Flash the same ExpressLRS version on the module and the receiver first. Then enter the same phrase in the module menu and in the receiver settings.
Use only letters, numbers, and dashes in the phrase. A phrase with a typo will never bind, so copy it exactly on both sides. The EP1 receiver weighs 0.41 g and binds with the same phrase.
What if the receiver will not bind?
Power the receiver 3 times in quick succession to enter bind mode without a phrase. The ExpressLRS binding guide covers this fallback step by step.
Check that the firmware versions match on both sides. A major version mismatch blocks binding even with the right phrase.
How do you check the link before flying?
Open the receiver tab in Betaflight Configurator and move the sticks. The channel bars should move smoothly with no jumps or dropouts.
Walk 30 m away with the quad on the bench and watch the link quality. A link that drops at 30 m will fail in the air.
Steps
- Flash the same ExpressLRS version on the module and the receiver.
- Set one binding phrase on both sides, using letters, numbers, and dashes only.
- Wire the receiver to a UART and power it from a 5 V pad.
- Set the UART to CRSF in Betaflight and save the settings.
- Power the quad and check that the receiver binds on its own.
- Move the sticks in Configurator and confirm the channel bars respond.
Frequently asked questions
Do I need a bind button on an ELRS receiver?
No. A binding phrase replaces the button. The three-power-cycle trick enters bind mode if no phrase is set.
Can one phrase bind many receivers?
Yes. Every receiver with the same phrase binds to the same module. Use one phrase for your whole fleet.
What happens if I change the phrase later?
Every receiver with the old phrase stops binding. Update the phrase on all receivers, or reflash them with the new phrase.
Does ELRS work on 900 MHz too?
Yes. ExpressLRS supports 900 MHz for longer range at lower packet rates. Most freestyle pilots use 2.4 GHz at 500 Hz.
Parts used
RadioMaster RP2 V2 ExpressLRS ELRS Nano Receiver 2.4GHz CRSF 5V 0.55g Built-in Ceramic Antenna for FPV Drone Whoop RC Plane Part, $61.99. RadioMaster RP2 V2 2.4GHz ELRS Nano receiver : 0.55g, built-in ceramic antenna, TCXO, 500Hz refresh, 13x11x7mm for micro drones and whoops. Ships from NY, USA.
RadioMaster RP3 Diversity ExpressLRS ELRS 2.4GHZ Nano Receiver Dual Antenna, $45.66. RadioMaster RP3 Diversity 2.4GHz ELRS Nano receiver : dual 65mm T-antennas, ESP8285 + SX1280, 500Hz refresh, 4.6g, ELRS v3.0 pre-installed. Ships from NY, USA.
RadioMaster RP1 V2 ELRS Nano Receiver 2.4GHz CRSF 500Hz With 65mm UFL T Antenna For TX16S TX12 Boxer Zorro FPV Drone RC RX Kit, $58.99. RadioMaster RP1 V2 2.4GHz ELRS Nano receiver : ESP8285, CRSF, 500Hz refresh, ~0.8ms latency, 65mm UFL T-antenna. Pairs with TX16S, TX12, Boxer, Zorro. Ships from NY, USA.
HappyModel EP1 TCXO 2.4GHz ELRS Receiver, Ultra Light 0.41g, 10x10mm, 25Hz~500Hz Refresh Rate, $31.50. HappyModel EP1 TCXO 2.4GHz ExpressLRS Nano receiver : 0.41g, 10x10mm, TCXO-stabilized, 25Hz: 500Hz refresh, ELRS V3.0.1 pre-installed. T-antenna included. Ships from NY, USA.
2.4G ExpressLRS ELRS Receiver for FPV Freestyle Long Range Drones, $18.57. HPXGRC 2.4GHz ExpressLRS receiver for FPV freestyle and long range drones. Fast, high-speed signal link for DIY RC builds. Ships from NY, USA.
ER4 2.4GHz ExpressLRS PWM Receiver, 4CH, 10mW, $53.99. RadioMaster ER4 2.4GHz ExpressLRS PWM receiver, 4 channels at 10mW. Compact composite build for FPV quads and fixed wing models running ELRS. Ships from NY, USA.
FS-G7P+ 10CH 2.4GHz RC Transmitter, 300M, with FS-R11P Receiver, $30.99. Flysky FS-G7P+ 10-channel 2.4GHz RC transmitter with FS-R11P and FS-R7P receivers. 300M range for RC crawlers, trucks, cars, boats, and robots. Ships from NY, USA.
DS800 8CH 2.4GHz Radio System Transmitter with F-08A Receiver, $21.14. HOTRC DS800 8-channel 2.4GHz radio system with F-08A receiver. For RC cars and boats. Ships from NY, USA.
MC6C 2.4GHz 6CH Transmitter with Receiver, $46.80. Microzone 2.4GHz 6CH transmitter with PWM and SBUS receiver. Over 800 m range for airplanes, multirotors, cars, and boats.
SpeedyBee F7 V3 50A Stack with BL32 4-in-1 ESC for FPV Racing, $145.99. SpeedyBee F7 V3 stack with BL32 50A 4-in-1 ESC for FPV racing. FC only, ESC only, or full stack. STM32F722, BMI270, Bluetooth config. Ships from NY, USA.
UAngel F722 F7 Flight Controller Stack with 45A/60A 4-in-1 ESC and VTX1000 for FPV Racing, $54.87. UAngel F722 F7 flight controller stack with BLHeli_S 45A/60A 4-in-1 ESC, FC only, ESC only, stack, or stack with VTX1000. STM32F722, ICM42688, Betaflight. Ships from NY, USA.
Related buying guides on Quality RC Parts
RC Receivers and Transmitters in the USA
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Sources
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Last updated: 2026-11-10.