Does Lisan B&B Tibet Hotel charge for oxygen supply?

According to the relevant information in Xiaohong's book, because Tibet is at a high altitude and often lacks oxygen, the oxygen supply in the hotel is free when traveling in Tibet.

Oxygen supply refers to the use of centralized oxygen supply system to decompress the high-pressure oxygen in the oxygen gas source, and then transport it to the gas terminals through pipelines, where it is supplied by ventilators, oxygen outlet pipes and other equipment to meet people's oxygen demand.