The 944 is a hand-wound skeletonized movement made up of 340 pieces. It features a minute repeater which is activated by closing a curtain over the skeleton movement. When the curtain is closed, the watch resembles the original Jaeger-LeCoultre Reverso from the 1930's. But opening the curtain reveals a full ruthenium skeleton movement.
The JLC 944 runs at 21600 vph and has 35 jewels. It is a double barrel movement with a power reserve of 35 hours.
Jaeger-LeCoultre currently uses this calibre in the Reverso Répétition Minutes à Rideau.