WoSport also got a Chrono that you can connect to a mobile app via bluetooth. Bruce of BB2K Airsoft tells more about the Wosport WST-X01... "Today I show you a really brilliant chrono that I personally do not want to miss anymore. The WoSport WST-X01 chronograph can be paired with the smartphone (Iphone or IOS and Android) via Bluetooth. With the app you can comfortably adjust the chrono, read off the values, analyze the data of the fired shots and record the whole if necessary.