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HD Colour Screen:View rich colours and daily stats on Tempo C's high-definition screen to get a clearer picture of your life. Sleep Monitor and Alarms:Automatically track your sleep durationThen wake up peacefully with a silent alarm IP67 Splash Resistant All day Tracking:Record your steps,distance,calories burned,active minutes and hourly activity Screen Size: 2.4cm(0.96) IPS true colour BT Version: BT 4.0 Battery Type: Polymer lithium battery Battery Capacity: 85mAh Standby Time: 20 days Bracelet Size: 240*21*12.5mm Material: ABS/PC/TPU Waterproof: IP67 Brand : ORAIMO Color : Black Display Type : Digital Type : Fitness Trackers Compatible with : Andriod & iOS Size : M Are batteries needed to power the product or is this product a battery : Yes