SensorKit S1 Developer Kit is a universal sports sensor kit for developers and sports scientists. It works out-of-the-box with Winter Sports and Active Fitness apps or 3rd party apps with an open source Sensor Kit SDK. You can order developer edition of SensorKit for your experimentation and ready-to-go for a developer, sport scientist or if you are just curious about collecting sensor data. The kit includes ready to go sensor, S1 firmware, 2x straps, casing. The CR2032 battery is not included to simplify shipping, but it's low cost and is available in most stores.