Frequently Asked Questions
You don't need to! The sensor is generally always on, waiting for you to start playing. As soon as it sees a shot or two it will wake up fully and start recording your match or practice. After you finish playing it will turn itself off again after about 5 minutes without any shots being played.
You may notice the sensor waking up inadvertently if you shake or bang your racket off court. No problem - it will quickly go to standby again as soon as it sees you are not playing. Nothing will get synced in this case.
We know it can be difficult! We've made them super secure so that there's no chance of them coming off during a match. The best way to get them off is to hold the racket by the grip with the head face down or on the floor. Then use the thumb of the hand that is holding the racket to press down firmly on the small tongue that protrudes from the base of the sensor and holds it in place. Once it is all the way down, you can use your other hand to simple slide the sensor off.
We rely on three small pips on the base of the dock to hold it off the butt cap slightly to allow the tongue to be pressed down. But all rackets are different: on some rackets the dock can end up sitting flush to the butt cap making it difficult to depress the tongue. It's best when you install the dock to make sure there is a small gap - a couple of millimetres is enough.
See the short video below.
If you leave a 5 minute gap between matches or practices, then your sensor will switch off automatically and the next match you play will be recorded as a new match. If you want to go straight from one match to another, you need to sync your data in between or all the data will be counted as a single match.
At present, the date and time shown on each practice or match is from when you uploaded it, not when it was recorded. Syncing your data soon after playing will keep the dates and times close to that when the match was played.
If the battery runs down, then the sensor won't wake up any more when you start to play - you need to re-charge it first. Simply plug it into a power source via the USB cable supplied and it will re-charge itself. The red LED comes on while recharging and goes off when fully charged. Once charged (which takes a couple of hours for a full charge), you should be able to play for around 10 hours before needing to charge again.
No problem. You will need to remember your PIN (it's printed on the underside of the sensor), but apart from that you just need to install the app on your new phone and it will bond with your sensor when it start up. Then when you next sync it will get ALL the data from your sensor and you are done. Note that each sensor can only be bonded to one app at once.
We test the system extensively as part of the development and in the lab we currently get 97.75% accuracy for the basic classification of shots into rallies. Of course we're working hard all the time to collect more data and improve the algorithms (based on the latest Machine Learning and Artificial Intelligence techniques) and squeeze out every last percentage.
To determine the winner/loser of each rally we need to figure out who serves. This can be hard to do because a serve and a receive often look similar in terms of the swing. So we determine who serves by looking for ball bounces shortly before the first shot of each rally. Many people do this instinctively so it's no burden - but you can help make your win/lose data accurate by making sure you bounce before you serve.
We use your personal data primarily for determining your calorie burn. This means that the figures you get from us are adapted to your specific gender, age, and weight. Without this, they would be much less accurate. In addition we need to know your handedness (left or right handed) in order to map shots into backhand and forehands correctly.
No - the sensor works totally stand-alone. You can play any number of matches without your phone being present, and then sync them to your phone next time you have it. If you do it this way, remember to wake your sensor up by plugging it in (and get the blue light on) before you sync your data.
No, once you start the sync process you can go to any other screen - or even turn your screen off - and the sync will continue. You must keep your phone relatively close to your sensor though - up to about 10 or 20 meters depending on the environment.
The sensor will only connect to the app when it is awake. Either it is plugged in and the blue LED is permanently on, or it is actively recording your play and the blue LED is flashing briefly every five seconds or so. At other times the LEDs are off and the sensor is asleep and conserving its power. After you finish playing a match the sensor will stay active for about 5 minutes or so in order to give you time to connect and sync your data. If you want to do it later (e.g. when you get back home), then you can plug it in to wake it up (and recharge the battery) and sync then.