Wireless activity and sleep wristband ‒ comfortable and advanced Fitbit Force is the first and only wireless activity and sleep-tracking wristband featuring an OLED display with real-time access to all your activity stats including stairs; wirelessly syncs to leading Apple and Android devices. Display: Display shows steps, distance, calories burned, active minutes, floors climbed, clock, alarm, incoming call notifications. Wireless sync to mobile: effortless, automatic and real-time syncing through Bluetooth 4.0 to smartphones. Android NFC enabled so you can tap to launch Fitbit stats. Battery life: 7 - 10 days.