Yaesu FC-50 Automatic Antenna Tuner

The control cable (1.6 foot) and coaxial jumper cable (1.6 foot) are included.
Two joint plates are also included if you wish to physically join the the FC-50 and FT-891.
Shown above with the FT-891 (not included). 

Specifications: 
* Coverage: 1.8 - 29.7 MHz and 50 - 54 MHz 
* Input Impedance: 50 Ohms 
* Maximum Power: 100 watts 
* Tune Up Power: 4 - 60 watts 
* Memories: 100 
* Tuning time: 5 seconds or less 
* Antenna matching impedance HF: 16 to 150 Ohms 
* Antenna matching impedance 6m: 25 to 100 Ohms 
* Power Supply: 13.8 VDC (derived from the transceiver) 
* Size: 6.1 x 1.8 x 8.3 inches (155x45x211mm) 
* Weight: 3 lbs. (1.35 kg)