Sensors do not automatically pair with the Coospo CS300. First, The lights do not work except for one brief second--How can you see these on the front when you are changing the batteries on the back to switch from speed to cadence? Tried multiple times to pair them. Even replaced batteries. No Luck. Will return and buy other sensors--Interesting that these are not sold in the bundle! I thought that buying from the same company would make things easier!.

Each item works as either a cadence sensor or a speed/distance sensor. I missed in the instructions that it is necessary to remove and then replace a battery in one to change its mode. But putting a battery in is difficult because the cap doesn't seat correctly some of the time. Once configured each works with an Apple Watch in Bluetooth settings, where it is easy to set the tire diameter for the speed/distance sensor. Once each is configured for mode and the Watch set for the proper tire circumference, they work flawlessly.

I bought this product for using on my Indoor trainer. This is working well with my bike computer as well. Its really awesome!

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I have had the CooSpo heart rate monitor with great success and usability. So I ordered the speed and candence sensors. They arrived quickly. The picture directions are clear about the install. Setting the modes between speed and candence is as simple as removing and replacing the battery.The connection to the Wahoo Bolt was quick. I connected using ANT+ since it had the strongest signal at a distance. The Bluetooth connection did show a weaker signal. Also Bluetooth in general uses a crowded spectrum so living in a urban population, the use of ANT+ is better.During my first rides they work great! The speed sensor wakes up at about 4-5mph after that it's accurate from 0 on your ride. There is a latency I noticed of 1-3 seconds in the data to the head unit.These sensors replace the Wahoo BlueSC and are far better than the magnet sensors.For durability, I am not sure how long the rubber neoprene bands will last. They give you many extra bands. I'll update my review if I have an issue.Great buy, easy to use, excellent value! I would recommend them.

The units are quickly recognized by iOS and Android. Wahoo also recognizes the devices. They are initially “seen” as cadence/speed. Android and Wahoo identify the Ant+ signal and the setting of cadence OR speed that is set when placing/replacing the battery as directed in the manual. I found it easiest to pair one at a time with the other “asleep”. Pairing the speed first was the easiest way to keep the sensor asleep while pairing the cadence, but the pairing can be done in any order before installing. Just remember or mark them to distinguish as they appear identical. iOS will pair with both, but in use will only recognize one or the other. The ble id does not allow me to use both at the same time. I attempted to pair them as one does for multiple earphones, but got wildly inaccurate data.There is a delay in the slope data for climbs and it varies based on ascent bs descent. The speed is accurate or the distance of a ride (avg), but may vary +- 0.5 mph for the current velocity (compared between android phone, wahoo ELEMNT, and wheel mount magnet with measured circ.Overall a good value for money that offers decent accuracy with some tolerance for error. Issues with pairing are primarily due to lack of any+ on the iOS and the dual ble signal of the units.

UPDATE: I've been using these sensors for several months now and just raced the SERC #3 race in Bryson City 1-14-2019. Weather was a mess and the tracks was all mud as it poured rain on us through the entire event. The sensors worked flawlessly and took the punishment of the mud and grime, including being completely submerged.I ride XC and some Enduro, putting about 3000 miles a year on my equipment. I was attracted to these because they were self contained FOB style at a very nice price point. Therefore, I purchased 2 of these sensors, one for cadence and the other for wheel speed. Currently I run them connected to a Lezyne cycling computer. However, for purposes of this review, I took the time to connect directly to an iPhone 6 and verified connectivity with both Wahoo and Strava (see attached pictures).The product comes in a sturdy, retail box with nice packaging. It includes the sensor, 2 large bands, 2 smaller bands and 2 mounting pads. Instructions are also included and have an English version that is easy to understand. The included bands are thicker in diameter than some of the others I have seen with Garmin and other devices, which is nice as I believe they will hold up better. I would estimate the thickness to be about 3.5 ml vs the 1.5~2 ml ones from other manufacturers. There are 2 rubber mounting pads, each are a different style. One is flat and the other concave. The flat one is used for mounting on a crank arm, the curved for your wheel hub. Installation is a snap, however, if you have a small J hook or similar dentistry tool, it will make installing the retaining bands a little easier. Remember, tight is good as you don't want them to move once installed. The mounting hooks on the sensor have a split in the middle, and it's the correct width for a small zip-tie. Although the bands look like they will do the job, I've added the extra security of a zip-tie. Being a mountain biker, I have been known to knock magnet sensors off my cranks that were secured by only bands.Setup: This is pretty straight forward. You will need to open the battery door with a coin or key and remove a plastic film which keeps the battery from making contact. When you reinstall the battery, you will want to do it with the top of the sensor facing you to see the light, as it doesn't stay on for very long. The color of the light is how you determine what mode it is in (speed or cadence). To toggle modes, simply remove and reinstall the battery. No buttons or complicated setup required, that's it.Pairing:First I paired to my Lezyne computer, which recognized them immediately. Once I had them connected, both icons were visible on the main screen. (see attached images). Also, in my images you will see 2 shots of the computer, one showing a speed reading, and the other a cadence reading. I tumbled each separately in my hand to confirm transmission.Next, I opened Strava on my iPhone 6 and paired from the Strava sensors page. Cadence mode will connect either individually under 'Cadence' or as cadence under 'Speed & Cadence' (see screen shots). However, speed mode will not connect. NOTE :: THIS IS A STRAVA ISSUE. You can go to the support threads on Strava's website and see plenty of discussions on the speed sensor issue. I do not know why Strava will not fix this issue, but using the Strava iPhone app with a speed sensor doesn't work. I posted a workaround for this on the support thread, but the long of the short is to use WaHoo or other app for recording and then share it to your Strava account. It's inconvenient, as you have 1 extra step, but it works.For Wahoo app on the iPhone, setup was a snap. A really nice thing about wahoo, is it will display the broadcast serial number for the sensor which is also printed on the back of each sensor. In the event you pull them off your bike for cleaning and mix them up, Wahoo will help you identify which is which (see screen shots).Durability:I have not had these sensors long, but they do appear to be well built and the battery door has a nice water and dust proof seal. I will only update this post if there are issues with durability.My Thoughts:If you are looking for a good set of sensors that are small, self contained and do not require magnets, at are really good price point, I would highly recommend trying a pair of these, it really seems an obvious purchase choice.My thoughts on CooSpo - I originally came across this company 3 years ago on aliexpress. I have purchased several of ther HRM chest straps and 2 Cadence/Speed combination units. I've never had any issues and I've only replaced units that I lost, or I damaged from severe off road riding. Their previous products have lived up beyond my expectations and I have high hopes for these newer models.