The Flysky FS-R4B 4-Channel Receiver is a compact and reliable solution for RC enthusiasts looking to expand or upgrade their radio systems. Designed to work with the ANT protocol, this receiver offers a stable 2.4GHz connection and supports up to four PWM channels. Its small form factor makes it an excellent fit for RC cars, boats, or other compact applications, without sacrificing range or signal integrity. With support for RSSI and online updates, it brings modern functionality in a lightweight, durable package.