TFR8S replaces the TFR8. The 8S can work with the transmitters failsafe. Of couse you can still program the failsafe into the reciever if you prefer.

Compatibility:
FASST 2.4G Air Systems (7CH Mode/Multi Mode): 6EX, 7C, TM-7, TM-8, T8FG, T10C, TM-10, T10CG, T12Z, T12FG, TM-14, T14MZ, etc.

Specifications:
Number of channel: 8
Operating Voltage Range: 3.5V~10V
Operating Temperature Range: -10℃~60℃
Operating Current: 100mA
Dimension: 53mm*30mm*11mm
Weight: 13.5g
Latency: 14ms (FS)
                 7ms (HS)

TFR8-S can parallel with TFR8/TFR8-S to become a multi-channel FASST compatible receiver. Follow the steps below:

   1) Bind both receivers to the transmitter/transmitter module first;
   2) Connect CH1 & CH2 of TFR8-S by a jumper, then CH3 will be shifted to CH9, CH4 will be shifted to CH10, and so forth;
   3) The two receivers can be placed in different parts of the model.
 
Please note that there are many differences between other brand and FrSky, especially in the binding procedure and failsafe setting. Read the instruction manual carefully and set up devices as described below.