TFR4B is support CPPM and RSSI (PWM) output - If CH3 and CH4 are connected by a jumper, CH1 will output CPPM for CH1~CH8, and CH2 will output RSSI (PWM).
TFR4B has two selectable failsafe setting options.

Features:

• Compatible with FASST 2.4G: Air Systems (7CH Mode/Multi Mode) & Surface Systems (C1 Mode);
• CPPM and RSSI (PWM) output - If CH3 and CH4 are connected by a jumper, CH1 will output CPPM for CH1~CH8, and CH2 will output RSSI (PWM);
• Light weight and small size;
• Two selectable failsafe setting options

Compatibility:

• FASST 2.4G: Air Systems (7CH Mode/Multi Mode) & Surface Systems (C1 Mode) (3PK 4PK/4PKS etc.) 
• FrSky TF Modules: TF-8M, TF-14M

Specifications:

• Number of Channels: 4
• Operating Voltage Range: 3.5V~10V
• Operating Temperature Range: -10~80 degree Celsius
• Dimension: 42x19x7mm
• Weight: 5.0g

Package Included:

• 1X FrSky TFR4B  Receiver