Combined with smart phone, though common in appearance, it can realize intelligent function through phone software

Real-time broadcasting to warn user of safety: to report the riding speed, cadence, riding time, alerts etc., so that it can urge user to pay more attention to safely riding.

Real-time recording the information on road, informing users of instant speed, cadence, time, mileage, calorie consumption, elevation along the way and so on. Besides, It can also record riding trace with GPS function in your phone.