When using oxygen therapy, there will be other things you'll find yourself needing besides just your oxygen concentrator. The miscellaneous accessories you need with the use of an oxygen concentrator will make your life easier and generally give you more peace of mind. These things contribute to your safety, first and foremost.
Pulse oximeter: It's helpful to be able to check your blood oxygen level at any point during the day, without having to visit your doctor or an emergency clinic. If you have been having trouble and you suspect a exacerbation is coming on, you can tell if you need to seek medical attention right away if your blood oxygen level has dropped. By keeping an eye on this, an exacerbation can be quickly treated before it worsens, or your doctor might be able to up your dosage of oxygen.
Back-up power: You don't want to lose power and not be able to use your oxygen concentrator when you need it. It's a good idea to have a home generator as back-up in case of a power outage. If you have a concentrator that runs on a battery and you can't charge it directly from an outlet, you can use an external battery charger, depending on the model. These will ensure that you always have another fully charged battery to power your concentrator.
Room humidifier: Many people who use oxygen therapy for many hours out of the day or during the night suffer from a dry throat or dry nasal passages, even with the built in humidifier on the oxygen concentrator. Room humidifiers are often inexpensive, and all you will have to do is refill it each day with fresh distilled water and rinse it out with hot water and vinegar to prevent the breeding of bacteria while the humidifier isn't running. Run the humidifier in the room with you while you are using your oxygen therapy.
Lint-free cleaning cloths: These might seem trivial, but they are necessary for keeping your oxygen concentrator clean. You need to be able to wipe off the vents on the oxygen concentrator, which is where the air is brought into the machine, so it can filter the oxygen that you breathe in. The vent needs to be free of dust and dirt, which can clog up the machine over time, and you definitely don't want to be breathing dirt or dust. A lint-free cloth will get rid of these things, without leaving any lint or fibers behind, which can also be sucked in through the vent.
Automobile input cable: You will likely be traveling by car, or you might be planning on going on a road trip, during which time you will be using your portable oxygen concentrator. The automobile input cable plugs into the power outlet in your car, and will keep your machine powered without worrying about draining the batteries.
Cell phone: You should always have a fully-charged cell phone on you, in case you need help. Your car can break down, or your power can go out and you won't be able to use the house phone. Most of the time, a prepaid plan is more cost effective than a service contract.