oxygen and carbon dioxide transducers, coupled with a very small dead-space sampling circuit means that performance is not compromised. Do you need technical skills? Not at all. Technical procedures are taken care of by COVOX System Software. If you should run into trouble, then we can access the Cart and operate it remotely, over the Internet and give you real time assistance! How much preventive maintenance is required? Apart from cleaning the breathing valve, none at all. Annual servicing however is recommended. How much are repairs and servicing likely to cost? For the first year nothing at all, apart from courier costs. A full warranty is offered - on a return to manufacturer basis. A fixed cost annual warranty is also available from 8% of the cost of the cart, according to the model.