Fitbit Flex, shown below, has five indicator lights that flash various patterns depending on what the tracker is doing.
Tap your Flex to see your progress towards your daily activity goal. Each solid light represents a 20% increment toward that goal. For example, if your goal is 10,000 steps, three solid lights means you're approximately 60% of the way there and you've taken about 6,000 steps. When you feel Flex vibrate and it starts flashing, you'll know you've reached your daily goal.
While Flex is charging, each pulsing indicator light represents progress towards the total charge in increments of 20%. When Flex is completely charged, all 5 lights will blink.
When a silent alarm goes off, Flex vibrates and the center light flashes.
Manual sleep mode
Flex tracks sleep automatically without any action on your part. If you want to know how long it takes you to fall asleep, put Flex into sleep mode manually. To do so, tap it rapidly for one or two seconds until it vibrates and shows two slowly dimming lights. Throughout the night, two blinking lights will alternate. To exit manual sleep mode in the morning, rapidly tap Flex. It will vibrate, flash all five lights three times, and then display a spinning light pattern.
These light patterns apply to manual sleep mode only. If you let Flex automatically detect your sleep, you won't see any special light patterns during the night.
Fitbit Flex 2, shown below, has five indicator lights that flash various patterns depending on what the tracker is doing. One light changes color while the other four are always white.
Tap your Flex 2 to see your progress towards your daily activity goal. Each solid white light represents 25% of your goal, so for example, if your goal is 10,000 steps and you see four white lights, you’ve gone at least 7500 steps. When you reach your goal Flex 2 vibrates and the lights flash in celebration. If you check your progress after you've surpassed your goal you'll see a flashing green light and four white lights.
While Flex 2 is charging, each pulsing indicator light represents progress towards the total charge in increments of 25%. When Flex 2 is completely charged, a green light flashes and all five lights shine for a few seconds before turning off.
When a silent alarm goes off, Flex 2 vibrates. A yellow light and three white lights appear for 30 seconds or until you dismiss the alarm.
If you have call notifications enabled and your nearby phone receives a call, Flex 2 vibrates three times unless you dismiss the notification first. Answering the phone or double tapping the tracker both dismiss the notification. While the phone is ringing you’ll see a blue light and four white lights.
If you have text notifications enabled and your nearby phone receives a text, Flex 2 vibrates once and shows one blue light and one white light.
When you receive a reminder to move, Flex 2 vibrates twice and shows one magenta light and two white lights. For more information see What is a reminder to move?