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Adventure to new heights with the CITIZEN® Ecosphere. Our proprietary Chroma finishing adds that spark of color to this 1/5 -second chronograph measuring up to 60 minutes and 12/24-hour time. A stainless steel case with blue chroma-finish, black polyurethane strap and blue dial. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number B620.

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We stand by the quality and craftsmanship of our timepieces. Every purchase comes with our 30-day, money-back guarantee so that you can be sure your new Citizen timepiece meets your expectations. We offer free returns for added convenience. 

Our 5 Year Limited Warranty accompanies your purchase on, Citizen retail stores, and authorized Citizen dealers. CZ Smart smartwatches are covered by a 2 Year Limited Warranty


Our Five-Year Limited Warranty about the Citizen 5 Year Warranty

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Mens, Strap


Blue, Luminous Hands and Markers

Case Size (mm)


Case Material

Two-Tone, Stainless Steel


WR100/10Bar/333ft [Swimming, Showering & Snorkeling]


Mineral Crystal


B620, 1/5 Second Chronograph Measures up to 60 Minutes, 12/24 Hour Time, Date

Setting Instructions FOR CALIBER B620
Download PDF Watch Video
Ecosphere is rated 4.5 out of 5 by 33.
Rated 4 out of 5 by from Well Worth A Looksee . . . Purchased watch about a month ago, to replace my other EcoDrive/Automatic that I had, and wore daily, for 11 years. While not having an automatic function - sorely missed - this one has served well as a replacement. It has been accurate to the second and an added bonus feature is the duration of the luminescence that works through most of the night. This is my third Citizen watch. The first - the WindSurfer model - is more than 30 years old and still works just fine [if I remember to change the battery!] - hence the new overwhelming acceptance of a EcoDrive system.
Date published: 2017-01-21
Rated 3 out of 5 by from Great looking however......... I’ve had my watch for the past four years. I have worn it pretty thoroughly. And the polyurethane watchband absolutely comes apart will break apart and that amount of time. Really really want a metal band so it doesn’t continue to happen and can’t find one. Why get the other band when it’s just going to do the same thing in the next four years.
Date published: 2019-11-03
Rated 1 out of 5 by from Handsome watch, but unreadable in low light This is supposed to be illuminated but only the 12 has a small dot and the hands are dim. No other glowing on the face. Returning because it’s hard to read in low light or in the dark
Date published: 2019-01-08
Rated 5 out of 5 by from A great timepiece for any occasion I was given my citizen ecosphere as a gift from my wife. I was first impressed with the overall look and quality of this watch. The blue face plate with dark blue housing really stands out yet compliments each other. The wristband seems comfortable and durable to provide long life and usage. The display is easily readable in low light and in average lighting provides a classy look as well. Setting the watch is simple and easy. I'm honestly proud to own this timepiece and Would recommend this to anyone looking for a new watch.
Date published: 2017-01-11
Rated 2 out of 5 by from Review I bought my Ecosphere a month ago. It is not keeping time accurately.(Slow) I have had to reset twice already.
Date published: 2018-03-08
Rated 5 out of 5 by from My Second Chronograph! This watch is the second chronograph in my collection, and this watch is also my second Citizen, I absolutely love this watch, even though it is advertised as having a 48mm case diameter to me it doesn't seem like as big of a watch as it fits perfect on my 7 inch wrist. Nevertheless, it is a happy addition, hopefully there will be many more great Citizen watches to come!
Date published: 2020-02-04
Rated 5 out of 5 by from Good looking with function! I would not have picked this watch out but it was an Anniversary gift. I have a Citizen diver watch that I have worn for over fourteen years and tend to like that style. This is now my favorite watch and I'm happy to be wearing a good looking and functioning watch. Looking forward to the many years of trouble free quality I have had with Citizen!
Date published: 2017-01-11
Rated 4 out of 5 by from Great watch Great watch, looks great and wears well. Exactly what I was looking for in my next watch. This my third Citizen watch, and haven’t been disappointed yet. The band fits well and is very durable. Keeps great time. Only downside is the chronograph buttons are large and I often start stopwatch when I flex my wrist. I wear it every day.
Date published: 2019-05-22
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I have the blue Ecosphere 620. Great watch and really enjoyed having it. The band broke and now I need to purchase a Replacement. My question is do I have a choice of a metal band or is my only choice the rubber one that comes with the watch?

Asked by: Rich313
The same thing happened to me. I took mine to my local dealer and was offered two options for the band replacement, the rubber and a black metal linked band. I got the rubber style again and the price included the install. That was over a year ago so you might want to check with your local dealer to see if it is still available.
Answered by: serplus
Date published: 2019-10-23

Is the watchband replaceable with a leather band? Or a metal mesh band?

Asked by: Mleepdx
If it fits properly. I do not know.  You are the people that came up with the  design .
Answered by: Sad customer
Date published: 2019-12-14

the watch band hurt me, I'm in Colombia and the distributor does not have it, where can I get it? the watch is an ECOSPHERE B620-S094909 Thanks for the attention and I am attentive to the response

Asked by: Wilson
I am sorry to hear the watch band has hurt you. We have a few service centers in Columbia that may be able to get you a replacement band. Visit our global support page and select Latin America. There you can select Columbia and their contact information is listed. Global Support
Answered by: CitizenCS
Date published: 2018-09-08
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