[Lad Weather] Infrared Heart Rate Monitor Calorie Exercise /Jogging/ Walking Running Outdoor Bluetooth Sports Watches [Specifications] Display type: Digital Waterproof: 3 ATM water resistant buckle: closure ceremony hole [Function]Heart Rate Monitor/ Exercise Time/ Calories Display/ Maximal Heart Rate/ Average Heart Rate/ Calorie Consumption/ Exercise Intensity/ Target Heart Rate/ Heart Rate Alarm/ Stopwatch/ Alarm/ Zone Alarm/ Backlight/ 12/24 hour display switching [Material] Case: polycarbonate/ABS belt: polycarbonate [Size]Dial diameter: about 40mm (liquid crystal diameter: about 27.5mm)/ Case thickness: about 13mm/ arm around: About 22.5cm(maximum)/ Belt width: About 20mm/ Weight: about 51g [Accessories]Box/ Instruction Manual/ Warranty