You will need to attach a small, widely available inexpensive magnet to your bike. Sold without charging cable.
Dura Ace 9200 Dual Sided Power meter 170 52-36T 12-S
Dura Ace 9200 Power meter Dual 52/36 172.5 Brand new In box.
Dura Ace 9200 crankset 4iiii Single Sided Power Meter 52/36 170mm Crank Length
DURA-ACE Di2 DUAL CONTROL LEVER 2X12s - RH/LH Pair
Shimano Dura Ace FC-9200-P Power Meter Cranckset 172.5
Dura Ace 12 speed 9200 Partial groupset in very good condition
