Product Description.

FPV Receiver RadioMaster ER5A ER5C 5CH 2.4GHz ExpressLRS ELRS PWM Vertical Pin Receiver for RC Planes Cars Boats RC Toy Parts .

Features
Supports 8.4V HV servos and accessoriesRobust, injection-molded receiver casing
Fast response speeds, incredible range
Supports 4 proportional and 1 switch channel (ExpressLRS 2.x)
Supports 5 proportional channels (ExpressLRS 3.x)
Compact size, easy to install.
Perfect for Surface, marine, and air R/C applications.
Specification

Item: ER5A 2.4GHz RX
Power supply: DC 4.5-8.4V
Antenna type: high sensitivity T-shape antenna
Wireless Protocol: ELRS 2.0 pre-installed
Output channel ExpressLRS 2.x: CH1-4 standard PWM; CH5 switch (ON/OFF) PWM
Output channel ExpressLRS 3.x: CH1-5 standard PWM
Weight: 6.6 grams
Size: 37*19*13mm

Item: ER5C 2.4GHz RX
Power supply: DC 4.5-8.4V
Antenna type: high sensitivity T-shape antenna
Wireless Protocol: ELRS 2.0 pre-installed
Output channel ExpressLRS 2.x: CH1-4 standard PWM; CH5 switch (ON/OFF) PWM
Output channel ExpressLRS 3.x: CH1-5 standard PWM
Weight: 5.5 grams
Size: 31*19*13mm