FrSky TFR8S replaces the TFR8. The FrSky 8S can work with the transmitters failsafe. Of couse you can still program the failsafe into the reciever if you prefer. FrSky TFR8S FASST Compatible 2.4ghz Receiver compatible with all Futaba FASST transmitter systems for air and ground R/C applications and can be doubled up with another TF receiver for expanding to 8 channels

FrSky TFR8S Features:

Compatible with FASST 2.4G: Air Systems (7CH Mode/Multi Mode) & Surface Systems (C1 Mode).
Parallel with TFR8/TFR8-S to became a 14 channel FASST compatiable receiver.
Two selectable failsafe setting options.
Improved capability of anti-interference.
Firmware upgradable

FrSky TFR8S Specifications:

Number of Channels: 8
Dimension: 54 x 30 x 15mm
Weight: 13.5g
Operating VoltageRange: 3.5V~10V
Operating TemperatureRange: -10°C~60°C

FrSky TFR8S 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.

What's in the Box:

1 x TFR8S
2x Short tool
1 x Manual

From: https://www.horusrc.com/en/frsky-tfr8s-8ch-accst-receiver-telemetery.html