Easy to UseSmart Heart Rate Monitor goes with a soft elastic strap, providing you a comfortable fit.Dual SupportFeaturing the application of dual technology, ANT+ and Bluetooth, Smart Cadence Sensor is able to connect to both cycling computers and smart phones. It is compatible with most devices on the market. Features: ANT+ Bluetooth 4.0 Specifications: Dimensions: H:2.5 x W:2.6 x D:3.8 cm Colour: Black Guarantee:12 Months Model Number: BRYACC2309