KDator Car Tyre Pressure Monitoring System TPMS Alarm Warning System with 4pcs External Sensor By Bluetooth 4.0 For Iphone IOS Android Mobile Phone APP

only 2 would connect to the app/blue tooth, item was well packaged and easy enough to install.. if they would connect!

I am very happy with this system.

The AppThe application main screen is clear and initial viewing indicates that it is a usable product. However on my car there are different tyre pressures for the front tyres to the rear tyres, as with most vehicles. The app only allows you to put one tyre pressure limit in, so any warnings are generally useless.Updating of tyre pressure reading. Readings are sent from the tyre sensor to the application at random intervals. This is fine if you are monitoring the tyres on a permanent basis, but if you just want to do a snapshot check of the tyre pressure on the vehicle is useless. I had to wait up to an hour while next to the car (ie in bluetooth range) to get all 4 tyre readings. Not really a quick check on the tyre pressure.OK - so it designed to be used in the car and have the app running all the time. If you are this person then maybe ok. Just a warning though, the app seems to drain the phone battery at about 1% every 10 mins. The screen is overridden so it is permanently on. Then not much use unless power is supplied all the time to the phoneFinally, tyre pressure. I pumped all the tyres up with the same pump and the variation on the tyre sensors was about 2psi. This may be correct but given the other issues I just don't know. The temperature readings on each of the tyres varies a few degrees as well. Left wheel saying 10c and right tyre saying 6c. I don't care really about tyre temp as I can't do much about it, but I can't remove it from the display and it irritates me.In summary, I can't keep the app on all the time in order to get reading as it drains my battery and I can't just run it to just get a snapshot reading as it take up to an hour to get all the pressure readings. Basically useless in my opinion. Frustrated as a few mods and it might be very good