Fastrack Limitless FS2+ Smart Watch, 2.01" UltraVU Display, Functional Crown, SingleSync BT Calling, 110+ Sports Modes, 200+ Smartwatch Faces, Upto 7 Day Battery, AI Voice Assistant (Wine Red) Operating System : android & ios Special Feature : Activity Tracker, Heart Rate Monitor, Multisport Tracker, Phone Call, Stress Tracking Battery Capacity : 280 Connectivity Technology Bluetooth Wireless Communication Standard Bluetooth