Bontrager SpeedTrap Digital Speed Sensor The right match for your training Bontrager's 2.4GHz wireless SpeedTrap sensor mounts directly into the leg of compatible Bontrager forks in seconds, providing a clean look while preserving aerodynamics. Key features: ANT+ 2.4 GHz digital wireless speed sensor For use with Bontrager, Trek, and most ANT+ enabled wireless computers Works with Bontrager forks featuring SpeedTrap technology Some wheels may require the use of a SpeedTrap spacer Includes Bontrager wheel magnet and LR44 battery