This SMD SRX 3 receiver is Sanwa compatible with FHSS-4 and FHSS-3.

Features:
1. Sanwa compatible
2.4GHz FH3/FH4 Selectable Via Transmitter binding process 2. High performance CPU enhances precision control feeling
3. 4 channel support.
4. Micro size (Antenna-Free: 18.2x20.2x27.4mm).
5. Operating Voltage 3.5V - 8.4V:
6. Weight: 5g
7. Battery Voltage Fail-Safe Limit: 3.5-5.0V (FH3) / 3.5-7.4V (FH4)

SND SRX3 Sanwa FH5 Compatible 4CH Antenna-free receiver.

Description:

The SMD SRX3 Sanwa2.4GHz 4-Channel FHSS5 compatible SSL Telemetry receiver uses a built-in antenna with exceptional range and response time.
With a lightweight design and a small footprint, this receiver is great for 1/10 and 1/12 scale electric RC cars.
This receiver is SSL compatible with either the Super Vortex or PGS Servos (Sold Separately).
Package includes one receiver and one bind plug.

Futaba R304SB-E 4-channel Surface Receiver

SANWA RX-472 Telemetry/SSL Receiver 

- 2.4GHz FHSS4/FHSS3 Spread spectrum system 4ch 
- Sanwa Synchronised Link ( SSL ) function support 
- Sanwa Super Response (SSR) support 
- Lightest receiver in class 

Frequency - 2.4GHz FHSS4/FHSS3 
Channel - 4ch 
Nominal Input Voltage - 4.8~7.4V 
Dimensions - 30.0x23.3x14.0mm 
- 6.6g 
Compatible radio - M12, EXZES Z, MT-4 ( SSL not support ) 
SSL Function (Sanwa Synchronised Link) System From using both of "RX-472" and "Super Vortex Zero", Drivers operate "Code AUX Function" which is included on M12 & EXZES-Z and can adjust setting of equipment directly and quickly from Radios. 
In case of using SSL System, Drivers don't need to use Setting Card or PC. And also, Telemetry data can be sent to Radios without using any Sensors. 

In case of using MT-4 with both of "RX-472" and "Super Vortex Zero", SSL Function is not responded, but Telemetry data can be sent to Radios without using any Sensors.

- 2.4GHz FHSS4 Spread Spectrum System 4CH
- Telemetry-Compatible
- SSL-Compatible (SUPER VORTEX ESC etc.)
- Super Response (SSR) Mode Compatible
- Lightest weight in the same class receivers
- Frequency - 2.4GHz FHSS4 - Nominal Input Voltage
- 3.7-7.4V - Weight - 6.6g
- Channel - 4CH
- Dimensions - 30.0x23.3x14.0mm
- Compatible radio - M12S, M12, EXZES ZZ, EXZES Z, MT-4S, MT-4(non-Compatible with SSL),MT-S

- Do not cut antenna lead since it will decrease sensitivity.

- 2.4GHz FHSS4 Spread spectrum system 4ch
- SSL support (ESC: Super Vortex Series etc.)
- Built-in Antenna - Sanwa Super Response (SSR) support Frequency
- 2.4GHz FHSS4 Channel
- 4ch Nominal Input Voltage
- 3.7V~7.4V Dimensions
- 18.2x24.4x27.1mm Weight
- 7.1g Compatible radio
- M12, Exzes ZZ(Z), MT-4S, MT-4(No SSL support)

RX-482 Telemetry/SSL Receiver

- 2.4GHz FHSS4 Spread spectrum system 4ch
- SSL support (ESC: Super Vortex Series etc.)
- Built-in Antenna
- Sanwa Super Response (SSR) support

Frequency - 2.4GHz FHSS4
Channel - 4ch
Nominal Input Voltage - 3.7V~7.4V
Dimensions - 18.2x24.4x27.1mm
Weight - 7.1g
Compatible radio - M12, Exzes Z, MT-4S, MT-4(No SSL support)

For the SANWA M17, MT-5 and MT-R transmitters is this budget friendly receiver.

Specifications Compatible with FH5/FH5U (M17/MT-5/MT-R)
Compatible with SXR Response Mode
Compatible with SSL Function
Voltage: 4.8 - 7.4 V Water Proof (as IPX4) Antenna pipe
COAXIAL ANTENNA with Antenna Pipe

*MT-5 indicator function is not compatible

The RX-493 receiver includes coaxial antenna and pipe for greater range and more stability.

The RX-493 is compatible with FH5/FH5U system for M17 radio ONLY.

Compatible with SXR response mode.

Voltage 4.8-7.4v and water proof (as IPX4) Compatible with SSL function.

Easy install antenna pipe.

26x23.2x14mm
6.2g
Recommended pipe length 100mm