Bluetooth: BLE 4.0 Charging method: USB charging Product Size: 43x37x13mm Product Weight: 35g Packing size: 98x98x32mm Suitable for indoor and outdoor: the battery life is up to 50 hours in training mode. Color touch screen, Side operation button, innovative pulse measurement on wrist, smart calorie counter and GPS through smart phone. Very Suitable for gym, group and team sports, swimming, running, cycling, jogging. Daily personalized training device: it can be called anytime and anywhere and assembled separately after the user recovers and the day shape. Training The unit provides visual instructions in real time. Buffer: analyze the * phase and provide detailed * graphics. Training load and recovery tracking tools help you optimize training and avoid overtraining. Run and ride performance Test your performance and personalize your heart rate, speed, and power zones. Collection Report: Night charging will provide daily feedback, night pressure and training.