Great quality, Stable performance Model Number : JX PDI-5521MG-180 JX PDI-5521MG-180 21KG Metal Gear Digital Standard Servo for RC Robot Car Boat Drone Helicopter
* Heart Rate & Sleep Monitoring: Tracks real-time heart rate automatically & continuously and automatically tracks your sleep duration & consistency with comprehensive analysis of sleep quality data, helping you adjust yourself for a healthier lifestyle * All-day Activity Tracking: Accurately record all-day activities like steps, distance, calories burned, active minutes and sleep status * Multi-Sport Modes & Connected GPS:…