Description: This RC receiver unit is KO PROPO high speed FHSS compatible. Features: 1. KO PROPO FHSS compatible 2. High performance CPU enhance precision control feeling 3. 4 channel support 5. Micro size (30 x 22 x 16mm) 6. Added failsafe function 7. Operating Voltage 3.5V – 8.4V: 8. Weight: 5g Compatible Transmitters: KO PROPO EX-RR KO PROPO EX-2 KO PROPO EX-1 RF Module RF-903FH RF Module RF-904FH Package Included: 1 x Receiver