If your phone has a headphone jack, you can just simply plug the device in. If it doesn’t have a headphone jack, you can use a suitable headphone jack adapter or you can use it with the Wireless adapter for Bluetooth phones.
How to blow
Use in a well lit area
The Smart Peak Flow has a little window on the top and requires light from above to operate. It doesn’t need to be direct light, but a dark room is not sufficient. The required illuminance is 100 lux or above. So for the best result use it in a well lit area.
More accurate than mechanical peak flow meters. Read more here:BMC Research Article