I'd been on the lookout for a TPMS system for a few months now, and had originally considered an RF-based TPMS system that would directly plug in to my Android HU via a USB receiver, thus eliminating the need of a finicky bluetooth connection with my HU. There were several appealing models available on AliExpress for about 2-3k INR, but unfortunately with our shipping restrictions I resigned myself to searching for a set locally.
Amazon has a few USB TPMS systems listed for about 4.5k, but honestly at that price range I thought it better to simply consider Sensairy. However, I wasn't keen about shelling out 7k for a set of sensors from Sensairy when I knew that the Chinese sensors would've performed just as well for about 2k. Nevertheless, an incident last week that involved a friend with a stranded Innova on a highway with a tyre punctured beyond repair and a similarly deflated stepney (story for another day) prompted me to expedite my plans for a TPMS.
Thanks to this thread about Treel as an alternative to Sensairy, I began looking out for a set of Treel sensors online and offline. They're priced horrendously online at about 7-8k at which point a Sensairy system is a no-brainer, but fortunately I lucked upon a dealer in Mumbai from the Treel website, who was offering a set of 5 sensors for 3k INR. This was a tad higher than the 500/sensor mentioned in this thread, but the dealer was close-by and quite forthcoming. Happy to share their details if anyone in Mumbai needs a set.
Here is the set of 5 boxes that I purchased, with each sensor packed individually.
As mentioned earlier in the thread, these boxes are meant to be sold along with the JKTyre's "Smart Tyre", and the box has a warning stating that no warranty would apply if these sensors are sold separately without the tyre. This clearly does not dissuade the dealers from reselling them, or myself for that matter, where I'm quite happy with a warranty-less set of sensors for less than half the cost, and considering I can easily replace one sensor for ~500 INR if there are ever any issues. The MRP on the box was 1799 and they were manufactured in March 2022.
The dealer wasn't able to install it themselves, so I got it done at another FNG for 100/tyre and 350 for balancing all of them, bringing my total investment to about 3.8k INR, which is much less than the 7k+installation for a Sensairy set. The installation took about 45 minutes in total, and while the sensors were being attached, I set up the "SMART TYRE CAR BIKE" app which is the official Treel/JKTyre app on the App Store. I had to have an account created, and after that linking the tyres was as easy as scanning a QR code on each box, and ensuring that this sensor was attached to the right tyre.
The sensors started receiving data immediately once strapped to the rims, and while there's no manual refresh in the app, the readings seem to refresh every 30-40 seconds which is sufficient. The installer claimed to have inflated the tyres to 33-34, but the app seemed to have all the tyres at 38, to which the installer replied that there will always be a fixed discrepancy in the readings. Fortunately, when I checked the tyres at home with my AmazonBasics inflator, I saw that they were all indeed at 38 (!!) and the sensors were actually within +- 1 PSI of the actual reading, which is pretty good. Safe to say I'm not going back to this FNG to fill my tyres.
The app is straightforward and lets you put in the Max PSI, Min PSI, and ideal PSI values. If the reading gets close to either the Max or the Min, the indicator changes colour and it sends a push notification from the app. The app does need both Bluetooth and Location permissions, which is intrusive, but technically makes sense since location permissions aid with better connectivity. I also tried installing the app in my Android HU, but seems like it wasn't supported from the Play Store. Instead I tried installing the APK provided here earlier, and that installed fine, but on starting the app it couldn't seem to obtain Bluetooth and Location permissions, and as a result the screen displays values correctly by fetching them from the online server, but it is unable to obtain the latest values via bluetooth, making this pointless unless I always have my phone active to read values and push them to the server.
All in all, this seems like a great value for about 3.8k INR, and I'd definitely recommend it if Sensairy isn't in your budget. Not having a warranty is a concern, but with electronics like these, if they aren't DoA they'll usually last long enough in my experience.