Super compact and also lightweight Lezyne bike sensors. The pair includes the Pro Speed Sensor and the Pro Cadence Sensor. Both sensors feature a translucent composite-matrix construction with an LED indicator. In addition, they are both equipped with a high-tech Bluetooth system that can be simultaneously connected to bicycle computers and Smart Trainers. The sensors are magnetless. Speed Sensor (Hub Mounted) Cadence Sensor (Crank Arm Mounted) Compact Lightweight LED Indicator​​