Yea .. Its wired to the slide pack - arm system ..
This thing is to retract wing spoliers in the path of the slide deployement .. it is designed to work regardless of anything powered on the ship IE electrics or hydraulics - Thing was developed because slides are puncturable. Boeing did not want to add the weight of accumulators .. If the thing deploys in flight - IE lightning strike etc. one turn of the wheel canels the system.
It is basically a transfer cylinder housing like a shotgun barrell with a piston separating the charge from the hyds. Firing the cylinder causes expanding gas to force the piston to translate, thus forcing hydraulic fluid out the output port.
I believe OEA Aerospace makes , Inc. It make something like 1450 psi. in a quarter second. Cant wait to see how & where these end up in the maintenance world ..