Description:
This RC receiver unit is Sanwa high speed FHSS-4 and FHSS-3 compatible. 
 
Features:
1. Sanwa 2.4GHz FH3/FH4 Selectable Via Transmitter
2. High performance CPU enhance precision control feeling
3. 4 channel support
4. Micro size (Antennaless:25.5x22x17.3mm,Standard:30x24x16mm)
5. Added failsafe function
6. Operating Voltage 3.5V - 8.4V: 
7. Weight: 5g
8. Battery Voltage Fail-Safe Limit: 3.5-5.0V (FH3) / 3.5-7.4V (FH4)
 
Compatible Transmitters:
Sanwa MT4
Sanwa MT44
Sanwa MT4S
Sanwa M11X
Sanwa M12
Sanwa M12S
Sanwa EXZES ZZ
Sanwa EXZES Z
Sanwa EXZES X
Sanwa MT-S
Sanwa MX-3X
Sanwa GEMINI X.