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
0.04 Pounds

💡Color-coded LED progress display

📶SmartTrack auto workout detection

🏊‍♀️Swim-proof & ocean-ready

HK$2037

Duties & taxes included

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Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

STAY CONNECTED ON THE GO - Get call and text notifications with unique vibrations and LED alerts right on your wrist.
SEAMLESS SWIM PROOF DESIGN - Dive into fitness with confidence—wear it in the pool, ocean, or shower without missing a beat.
SLEEP SMARTER WAKE REFRESHED - Track sleep quality automatically and wake gently with a silent vibration alarm.
DISCREET STYLISH WEARABILITY - Ultra-thin tracker hides in bands, bangles, or pendants—fitness that fits your personal style.
EFFORTLESS SMART TRACK TECHNOLOGY - Automatically logs your workouts so you can focus on smashing goals, not fiddling with settings.

The Fitbit Flex 2 is an ultra-thin, swim-proof fitness tracker that automatically tracks your daily activity, workouts, and sleep. Featuring SmartTrack technology, color-coded LED progress lights, and discreet wearable options, it keeps you connected with call and text notifications while fitting seamlessly into your lifestyle—whether at the gym, pool, or office.

Specifications

ASIN	B01KH2PV4U
ASIN	B01KH2PV4U
Batteries	1 CR2 batteries required. (included)
Battery Average Life	5 Hour
Battery Description	Lithium-Ion
Best Sellers Rank	#435,892 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1,194 in Activity & Fitness Trackers
Brand Name	Fitbit
Color	Black
Compatible Devices	Smartphones, Tablets, Desktops
Customer Reviews	4.0 4.0 out of 5 stars (5,284)
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	0.04 Pounds
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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