Communication Standards: ANT+ and Bluetooth Operation: 800 hours of operation (button battery CR2032) Dustproof and Waterproof Standard: IPX67 *Durable against short-term submersion, but swimming is not supported. Compatible Chest Size: 64-86cm Measurement Range: 30-240bpm Weight: Sensor 13g Other: Status indication via LED indicator This is an electrode-based heart rate monitor that is worn on the chest. It can be paired with various cycle computers, smartphone apps, and training devices that support ANT+ and Bluetooth. Generally, it is said to have better measurement accuracy than optical heart rate monitors. You can measure more accurately even before sweating by moistening the area where the electrodes touch before attaching the sensor. It's easier to put it on like you're wearing it rather than wrapping it around your chest. Please refer to the instruction manual for details on use. Shipped via anonymous delivery. If you purchase it together with items that can be shipped together, we will discount the shipping cost.