【Upgrade Version】Rocboc TPMS Tyre Pressure Monitoring System, Tire Pressure Checker Solar & USB Rechargeable, Auto Alarm and Real Time Detection, LCD Screen with 4 Waterproof External Sensors for Car

When I first bought one of these last July one of the sensors wouldn’t communicate with the main unit at all. The whole lot was sent back and another one bought. This all worked ok apart from the ladies voice sometimes misses a word out when it greets you initially, but this isn’t a real issue.I found the main unit relatively easy to install in my RAV4 and initially all was fine then about a month ago the right rear sensor suddenly said the pressure was low ( 20psi instead of 32 ) so I stopped and checked but the tyre seemed ok. When I got home I checked the pressure with a good quality gauge and it was still at 32psi ! But the sensor still said 20.I tried the batteries sent with it originally but no joy so I bought two new Panasonic batteries off Amazon but that still didn’t cure the issue. Apparently several people have had these type of issues but despite the seller ROCBOC stating “ We will always be at your service for any issues.” they haven’t replied to my query and it appears individual sensors aren’t available. If they wanted to get better reviews and a higher rating they should supply spare individual sensors, after all a replacement can be synchronised to the main unit like it says in the instructions.I reckon all of mine will fail sometime soon and I’ll have basically thrown £35 down the drain ☹️Poor show ROCBOC !Update as of 20/2/21 - having decided I’d nothing to lose I dismantled the wheel sensor and removed the circuit board from the casing. The pressure sensor has a small hole where it connects with the air in the tyre valve to read the pressure. I carefully inverted the board and tapped it and blew into it in case there was grit or something blocking it. After careful reassemble I fitted it today and it was back reading the correct pressure. This may be of help to anyone with the same issue.

I know that most modern vehicles have in-built tyre pressure monitors but my old Land Rover doesn't and these gizmos are perfect. I bought my first one on eBay a few years ago. After an initial charge from a USB charger the little solar panel was enough to keep it running for over a year, at which point the 1632 button cells in the sensors started dying.You're supposed to be able to unscrew the sensor to put a new battery in but, after a year of being on a wheel, the things become welded together. I ended up chewing the sensor cases so badly that I had to buy another unit. The thing had saved me from running on a flat so I don't feel that it owed me anything.The sensors on the second unit have started to pack up and, as before, trying to unscrew them ended up with them so badly chewed that it's time for a third one: this one.... and it's a little disappointing.The previous iterations gave a high pitched bleep whenever tyre pressure dropped. This one talks instead, but it has such a tiny speaker that it is difficult to hear, even in a quiet room. In a noisy old Land Rover it stands no chance.Overall, they are (in my experience) easy to fit, reliable and useful. It is a pity that one cannot buy new sensors as separate items, because these break when one tries to replace the sensor battery.The spoken alarm in this version really lets the unit down: I'm going to see if I can pair the four new sensors with my old monitor. If I can, this one is heading for the dustbin. Have a safe journey to the recycling plant, Rocboc.

Nice, compact unit looks good on top of dashboard, charges quite well, & despite what others say, I like the readout which I find quite clear and bright enough without being distracting.With all the warning beeps and bongs in modern cars, I thought a voice warning would be great.But like other reviews, I wish the voice warning were louder; unless you own a Bentley or a Rolls Royce, the voice is really too low to hear in a normal vehicle on a motorway or with the radio on.I have also found the accuracy of the readings to be suspect.On comparing and double checking with various hand held tyre pressure units, and the air pump at the filling station, I have found the readings under reported by 10KPA per tyre.So a tyre filled (and checked by other means) to 240KPA will show as 230KPA on the readout.Not sure if this is only on my unit and due to the readout unit or the tyre sensors under reporting.So I would not use this as an indication of the actual tyre pressure.But now I know about the variation, I have decided to keep the unit as a indicator to warn of anything unusual happening - keeping occasional eye on the readout, as I might miss any voice warnings..