What you see in the pictures is what you get. No cables, connectors (except what is shown in the pictures), or instructions included. I have 4 units. I am selling them individually but with bulk purchase discounts. 

Specs from the manufacturer: 

Maximum Pressure 40 bar, Airjacks must be installed vertical during operation. Do not work under the car, without using Safety Props. Do not remove the cap. Airjack is under pressure.

Airjack with a new innovative technic (without spring). Offers a high stability by a big diameter, very light. High-strength Aluminium.

Hub Stroke H [mm]: 150
O.D. Tube Ø [mm]: 50
mounting Ø [mm]: 53
Lift Capability max [kg/bar]: 488/40
Thread: M50x1,5
Weight [g]: 630*

More information can be found here:
https://www.krontec.de/katalog/pdf/Kapitel07_Lufthebeanlage/07-LL-21.pdf