Does it come with charger or do you have to buy separately?

It comes with a charger. I have not been able to buy it separately. You have to buy a whole new Flex 2.

Will this recognize activity from stationary cycling?

I don't think any one of these people really answered your question. It is not going to recognize that you are cycling and it will just run up your step count. I find this to be a problem because I am not taking any steps when I am riding my bike and don't want that counted as walking.

do you have to have the app or a phone

If your phone is not compatible with the device (as mine was not compatible) then you MUST purchase a dongle to go with this particular tracker as it is not included in the purchase of the Fitbit Flex 2. With a dongle plugged into your computer, you pull up the Fitbit icon on your computer and tell it to sync if it has not synced in a while....but it will sync from time to time on its own. If your phone does work with the tracker, then you just download the app and you are set to go.

Does this fitness tracker touch the skin? If so has anyone with a nickel allergy worn it for a substantial amount of time?

I have a severe nickel allergy -- rash, swelling, blisters. But the Fitbit Flex 2 band doesn't irritate my skin at all, even though I've been wearing it 24/7 since I got it. Granted, only the two little posts that secure the band (not the tracker itself) have any metal that touches my skin, but usually that would be enough to set my wrist on fire. When I researched before buying, the only official word I could get from Fitbit said the clasp is surgical grade stainless steel, which by definition shouldn't have any nickel in/on it.

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Fitbit Flex 2, Black (US Version)

Product ID: 69215231

Details

Battery description
Lithium-Ion
Battery life
5 Hour
Brand
Fitbit
Colour
Black
Compatible devices
Smartphones
Item weight
0.04 Pounds

👟Tracks steps & distance precisely

💧Swim-proof & water-resistant

🔋Ultra-thin with 5-hour battery life

AED 4

Duties & taxes included

In stock

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Description

🔥 Stay ahead of the pack with Fitbit Flex 2 – fitness that fits your lifestyle! 👟

DISCREET STYLISH DESIGN - Ultra-thin tracker that hides elegantly in bands, pendants, or bangles—perfect for any occasion.
INSTANT PROGRESS FEEDBACK - LED display lights up to show your daily goal progress at a glance—no smartphone needed.
LIGHTWEIGHT COMFORTABLE - Weighing just 18g with a sleek elastomer band, it’s built for all-day, everyday wear.
SEAMLESS ACTIVITY TRACKING - Monitor steps, calories, and active minutes effortlessly to stay ahead of your fitness goals.
WATERPROOF FOR EVERY ADVENTURE - Swim-proof and life-proof, designed to keep up whether you're in the pool, ocean, or shower.

The Fitbit Flex 2 is a sleek, ultra-thin activity tracker that monitors steps, distance, calories burned, and active minutes. Featuring a discreet LED display and swim-proof design, it’s perfect for professionals who want seamless fitness tracking without compromising style or comfort. Compatible with smartphones and built to withstand water exposure, it’s your all-day, every-adventure health companion.

Specifications

ASIN	B01KH2PV4U
Battery Average Life	5 Hour
Battery Description	Lithium-Ion
Best Sellers Rank	281,758 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 1,075 in Activity Trackers
Brand Name	Fitbit
Colour	Black
Compatible Devices	Smartphones, Tablets, Desktops
Customer Reviews	4.0 4.0 out of 5 stars (4,595)
Global Trade Identification Number	00810351028888
Item Dimensions L x W x H	16L x 9W x 11H millimetres
Item Weight	0.04 Pounds
Manufacturer	Fitbit
Manufacturer Part Number	FB403BK
Material Type	Elastomer
Model Number	FB403BK
Number of Items	1
Number of Packs	1
Sensor Type	Pedometer
Size	1 Count (Pack of 1)
Software Update Supported to Date	unknown
Team Name	Fitbit
UPC	810351028888
Unit Count	1.0 count

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