Fitbit Flex Activity and Sleep Tracker Wristband FB401FLEXBK- Android iOS- Black Compatible Operating System_iOS / Android 2ms Response Time – Ensures

2ms Response Time – Ensures smooth motion and reduced ghosting

HD Voice Technology separates your voice from surrounding noise

enjoy private listening with wireless headphones

Noise Cancelling Headphones: Enjoy the music you love without distraction thanks to active noise cancellation and two layers of passive isolation

control your player

Fitbit Flex Activity and Sleep Tracker Wristband FB401FLEXBK- Android iOS- Black Compatible Operating System_iOS / Android 2ms Response Time – EnsuresGenuine Fitbit name brand products, The Flex Series Activity Wristband. Model: FB401FLEXBK This model comes with an all black silicone band and display unit. Features: Compatible with Android, iOS, and Windows devices. Tracks all day activity like steps, distance, calories burned and active minutes Measure your sleep quality and wake with a silent, vibrating alarm LED lights show how your day is stacking up against your goal Fits comfortably around