When you're swimming, it can tell a breaststroke from a backstroke, from a kickboard.

游泳的时候，它能分辨你是在蛙泳，还是仰泳，还是在用浮板。

If it's a kickboard or if it's paddles or what have you, the - usually, the facility or the lifeguard can supply that.

如果它是浮板或桨或你有的东西，通常设施或救生员可以提供。