Sigma Duo ANT+/Bluetooth speed sensor

Track your cycling performance with pinpoint accuracy. The SIGMA Duo speed sensor uses dual ANT+ and Bluetooth Smart technology to wirelessly transmit precise speed data to your favorite devices. Enjoy broad compatibility, seamlessly connecting to cycling computers, smartphones, and smartwatches. Its slim, lightweight design mounts to your bike´s hub in seconds—no tools required. Built to be weatherproof and durable, it delivers reliable data in any condition, helping you monitor progress, analyze performance, and achieve your cycling goals