Cateye Magnetless Speed Sensor:

CatEye:

Dual band Bluetooth and ANT+, magnetless sensor with integrated accelerometer
Quick pairing with Cateye Cycling app (Bluetooth)
Waterproof IPX7 (based on JIS C0920)
Works with Padrone Digital, Padrone Smart+, Padrone Smart* and Strada Smart*
*For Padrone Smart and Strada Smart, works in Mirror Mode only