Coollang Tennis Racket Sensor Tracker Motion Detector Analyzer with Bluetooth 4.0 Compatible with Android and iOS Smart Phone(Black)

Don't waste your money. Despite the advertising there's no app available on android so this sensor wont work if you only have an android device. Even when I borrowed an iPhone it still didn't work properly.

In theory, I love this product. It measures your tennis strokes and the App is excellent. The one problem is fixing this device to the racket. There’s two options, the first is to use a sticking pad that sticks the device to the base of the handle, but if you hit hard then it regularly falls off. The second solution is to use the silicon holder that wraps around the base of the handle. However, it gets in the way of the handle and when your hand gets sweaty it slips. I do hope they can sort this out when they bring another upgrade. So I’d probably recommend you to wait until that happens.

purchased this to give it a try, as babalot pop is no longer available, so i have stopped using it.. Works just fine and provides you with a baseline measure, so you can track progress. You get use to the grip at the end of the racket and i hardly notice it is there. I have not tried the sticker, as i have a number of rackets so will stick with the silicone attachment. The results are good and take time to get use to the measures, but overall worth the money and is good fun to use. Turning it on is a bit of effort, but seems to work just fine, once you develop a technique..

The idea is great but the product doesn't work or record property

At first glance this is hugely disappointing. The instructions are written in pidgin english so its a matter of figuring it out. Eventually I got the sensor working and, by a miracle, actually conected to my phone. Then for about 20 minutes you get a message saying 'loading'. Loading what? For how long? Its a total fail, sadly. I tried it out - it said I did 38 shots, I did loads more; it said I did 0 serves when I did several; and the average speed of these 0 serves was 179kph!! I think - even were it to work convincingly - its more of a fitbit sort of thing than a device offering any worthwhile stats or information for a tennis player. THAT SAID , 2 days later having come to terms with it, it does provide some information that could be a benchmark in its own terms, whether its actually correct or not.

Good product, as stated on the box.

Thanks!

As described, (not sure what warmth has to do with it )