Features 1?? Package Included: With turbine machine, water pipe, and water bottle, which is same as standard chair operation method, foot pedal control. 2??2 Holes 2 Way: Turbine unit set adopted 2 holes and 2 ways design, with all the functions of a desk chair and meets everything for regular use. 3??Portable Size: 2 Holes turbine machine is small in size and light in weight, can be easily put in your bag, which can be used at any where. 4??Gas Pressure: 2 Way turbine unit adopted 4?8kg gas pressure input, and 0?4kg gas pressure output, which can provide stable performance. 5??Stainless Steel: Turbine unit set is made of stainless steel material, firm and sturdy, rustproof and durable, which can be used for a long time. Specification Item Type: Turbine Machine Material: Stainless Steel Control System: Gas control system (working with gas compressor) Gas Pressure Range: 0.01 mpa-0.4 mpa Gas Pressure Input: 4-8kg Gas Pressure Output: 0-4kg Water Pressure: 0.1mpa-0.25mpa Package List 1 x Turbine Unit 1 x Water Pipe 1 x Water Bottle