The Bluetooth/ANT+ Vaaka cadence sensor performs well on both single and double bladed paddles. Use it for Kayak, Canoe, Pacific Outrigger, Stand up Paddle Board and Dragon boat. It provides stroke rate feedback in realtime while paddling. Compatible with popular Bluetooth and ANT+ GPS Sports Watches such as Garmin, Suunto, Polar and the TomTom Multisport, and newer brands such as Coros Pace 2. Because most modern Smartphones now have Bluetooth, this Vaaka cadence sensor will also pair with your Bluetooth enabled smartphone.