Sony Smart B-Trainer MP3 Player Includes NFC, Bluetooth 4.0, GPS, HRM, Coaching Plans - 16 GB, Black (English Version) All-in-one device, equipped with 6 type of sensors (heart rate, accelerometer, GPS, compass, gyroscope, barometer) in a compact body Using the Smart B-Trainer app, select a training menu according to your goal (lose weight, build endurance, prepare for a marathon, etc.) and fitness level. Transfer the data to the device and start training. Voice guidance/coaching, while training, vocal guidance/coaching is periodically providing information such as your current heart rate and distance run. You can concentrate on your training and know your current fitness condition without the need to check the screen or operate any buttons. 11 types of running logs in a graphical display: heart rate, calories burned, distance, time, speed, pace, pitch, steps, strides, running route, altitude. 16 GB internal memory, Bluetooth 4.0, NFC, waterproof (IPX5/IPX8 rating), so regardless of sweat, water, or rain, you don't have to worry.