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), 1 Count

Fitbit Flex 2, Black (US Version), 1 Count

Product ID: 34007901

Details

Battery Description
Lithium-Ion
Battery Life
5 Hour
Brand
Fitbit
Color
Black
Compatible Devices
Smartphones
Item Weight
18.14 g

📊Auto workout & sleep tracking

🔋5-day battery life

🏊‍♂️Swim-proof & ocean-ready

Beschrijving

⌚️ Flex your fitness, your way—sleek, smart, swim-ready!

STAY CONNECTED HANDS FREE - Get call & text alerts with unique vibrations and color-coded LEDs—never miss a moment.
SEAMLESS SWIM SWEAT PROOF - Dive into your fitness routine without missing a beat—track laps, calories, and distance even underwater.
SMART TRACK AUTO RECOGNITION - Effortlessly log workouts with intelligent exercise detection—your personal trainer on your wrist.
SLEEP SMARTER WAKE REFRESHED - Automatic sleep analysis plus silent vibrating alarms for a gentle, personalized wake-up.
ULTRA THIN CUSTOMIZABLE STYLE - Discreet tracker slips into bands, bangles, or pendants—fitness that fits your vibe.

The Fitbit Flex 2 is an ultra-thin, swim-proof fitness tracker that automatically monitors your daily activity, workouts, and sleep. Featuring SmartTrack technology, customizable wear options, and discreet LED notifications, it empowers busy professionals to stay connected and motivated—whether running, swimming, or powering through the workday. With up to 5 days of battery life and a sleek design, it’s the perfect blend of style and performance for the modern multitasker.

Specificaties

ASIN	B01KH2PV4U
ASIN	B01KH2PV4U
Batteries	1 CR2 batteries required. (included)
Battery Average Life	5 Hour
Battery Description	Lithium-Ion
Best Sellers Rank	#294,101 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #741 in Activity & Fitness Trackers
Brand Name	Fitbit
Color	Black
Compatible Devices	Smartphones, Tablets, Desktops
Customer Reviews	4.0 4.0 out of 5 stars (5,294)
Date First Available	August 16, 2016
Department	womens
Global Trade Identification Number	00810351028888
Is Discontinued By Manufacturer	No
Item Dimensions L x W x H	0.64"L x 0.35"W x 0.45"H
Item Weight	18.14 g
Item model number	FB403BK
Manufacturer	Fitbit Inc
Manufacturer	Fitbit Inc
Manufacturer Contact Information	Customers contact: [email protected]
Manufacturer Part Number	FB403BK
Material Type	Elastomer, Stainless Steel
Model Number	FB403BK
Product Dimensions	10 x 0.45 x 0.37 inches; 0.64 ounces
Sensor Type	Accelerometer
Size	1 Count (Pack of 1)
UPC	810351028888
Unit Count	1.0 Count

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Onze prijzen zijn inclusief productkosten, internationale verzending, importrechten, douane-afhandeling en lokale leveringskosten. We verzorgen alle douane- en importprocedures, zodat er geen verborgen kosten zijn bij levering. PRO-leden ontvangen extra voordelen inclusief gratis verzending.

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De productkwaliteit is uitstekend. Precies wat ik nodig had voor mijn werk.

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