The stylish VIYONA VY-9S-7 oxygen concentrator is a great choice for home care and medical purpose .it has oxygen and nebulizer outlets one machine dual usage. Its ultra-quiet operation reduces noise complaints. VIYONA VY-9S-7 oxygen concentrator noise level is less than 40 decibels. Its compact design takes up less space, convenient to operate, and has real-time monitoring, safety protection features alert you when the system is abnormal. with Universal wheels and handle it is so convenient for the user to move the machine. The large LED display shows the oxygen flow and purity of oxygen, timing function is convenient for the elderly to operate the machine to set the inhale oxygen time by timing function. All the designs are customized to meet precise operations and enrich the customer experience.