Every device bearing the ANT+ logo has been tested and certified to conform to a very tight set of requirements. This ensures that when you are using an ANT+ device you know that it will transfer data in a specific format and will "just work". There are many devices on the market, and they are grouped according to the ANT+ type. Garmin (who own the ANT+ rights) provide a complete list of all devices and to what ANT+ profile they conform. If you choose something off the list, then you can be sure it will be compatible with other ANT+ devices.