The Sanwa/Airtronics RX-493i 2.4GHz FHSS-5 4-Channel Telemetry Receiver is a FH5 and SUR response mode compatible receiver that features a short coaxial antenna with an integrated antenna tube mount, ensuring stable performance in about any situation compared to built-in antenna receiver units. Furthermore the high-voltage compatible receiver is waterproof. The receiver measures 26×23.2x14mm, it weighs in at 6.2g and is designed to work with the Sanwa M17 or MT-5 radio system.