X2 pro heart rate belt, long-lasting battery life, the device is built-in rechargeable carp battery, no need to replace the battery, full battery life of about 30 days, the green indicator lights up when fully charged Dual-mode protocol support, compatible with a variety of devices, Bluetooth protocol ANT+ protocol accurate measurement, through the ANT+ protocol, connect to a variety of sports equipment, such as a code meter IPX7 waterproof rating, excellent waterproof performance, sweat and rain fearlessly Weight of the host is about 11g, lightweight design, no burden on the movement, easy to carry X2 pro heart rate belt adopts baking and polishing technology, with mirror-like smooth surface. Heart rate chest strap is to use the micro-voltage signal generated by the heart beat to amplify and process directly to get the heart rate value, the data is more accurate. Speed/distance estimation, after turning on the pedometer switch, you can record the step frequency, and estimate the distance and speed according to the step frequency, height, gender, etc. Calorie estimation, X2pro heart rate belt provides calorie estimation function, exercise consumption at a glance. X2 pro heart rate belt provides memory storage function, can be used as an independent exercise device, recording about 48 hours of exercise data, recording time is affected by the temperature and the use of the environment, such as out of the storage range, the new data will automatically overwrite the old data. Heart rate warning alert, during safe exercise, if the set warning value is reached, the heart rate monitor will issue a warning tone, connect the APP to manually turn on or off the heart rate warning prompts