Global Network


August 26, 2019

Connected Watch worn by Naomi Osaka in the 2019 US Open
CITZEN Eco-Drive※1 Bluetooth

Citizen Watch Co., Ltd.(HQ: Nishi-Tokyo, Tokyo; Toshihiko Sato, President&CEO) is proud to announce the model which will be worn by the professional tennis player, Naomi Osaka, our brand ambassador, at the 2019 US Open Tennis Championships.

Portrait of Naomi Osaka as she weard the new color of the
«CITIZEN Eco-Drive Bluetooth.»
CITIZEN x Naomi Osaka “Can’t wait for the next me.”
-This is a message that echoes our brand statement, "Better Starts Now,"
and is being rolled out in various communication efforts.

Naomi Osaka Grand Slam Model
CITIZEN Eco-Drive Bluetooth

In the 2019 US Open(8/26(mon) – 9/8(sun) Billy Jean King National Tennis Center, NY) where Naomi Osaka will be playing for the first-time as the defending champion, she will be wearing the «CITIZEN Eco-Drive Bluetooth,» a unisex model, which combines the Super Titanium™※2 case with its lightness and comfort and the cool navy color. This model captures Naomi Osaka’s swift and brisk playstyle on the court by combining the navy dial and band with the light Super Titanium™ case.

“The fourth model in my Citizen Collection is really cool! It’s cool navy!“ – Naomi Osaka

Since its launch in 2012, CITIZEN Eco-Drive Bluetooth has carved out a unique position in the connected watch market with its beautiful state-of-the-art designs. Since becoming the CITIZEN brand ambassador, Naomi Osaka has been wearing this popular series from August 2018 during her matches. It features the light-powered Eco-Drive technology that frees users from the hassles of charging, along with an intuitive alarm and time adjustment features which are all available with the app exclusively developed by CITIZEN.

With her commitment to constantly push herself to be the best as the world’s top tennis player, we are honored to have Naomi Osaka as our brand ambassador because she symbolizes and resonates with our belief, “Better Starts Now” which is about “It is always possible to make something better, and that now is the time to start doing it.” CITIZEN is proud to support Naomi as she continues to pursue her best performance as the world’s top player.

Product Features


・5 functions including the light-powered Eco-Drive

1. Light-powered Eco-Drive
2. Notification for incoming calls, emails, and SNS messages via sound and hand movement
3. Smartphone search
4. Three alarm settings
5. Date and time synchronization

・15 original sound options exclusive to the W410 model

■CITIZEN Watch App

・Features an easy-to-read white interface; includes battery charge meter

・Connection display feature to confirm smartphone pairing at a glance

[ “CITIZEN Eco-Drive Bluetooth” series worn by Naomi Osaka during her Grand Slam matches]

The line-up includes the model (left/ BZ4006-01E) which Naomi wore during her first US Open champion match in 2018 which was also her first Grand Slam as well as the model(center: BZ4005-03E) which she wore during Roland-Garros 2019, and the model(right: BZ4000-07L) which she wore during Wimbledon 2019.

Brand/Product name CITIZEN / Eco-Drive Bluetooth W410
Model BZ4006-01E BZ4005-03E BZ4000-07L
Suggested retail price USD 700
Case / Band Super Titanium™(Duratect DLC; bezel is Duratect GOLD) / Urethane Super Titanium™(Duratect DLC) / Urethane Super Titanium™(Duratect) / Urethane
Crystal Sapphire glass with anti-reflection coating
Case Size/Thickness 40.5mm / 10.68mm (design specification only)
Specifications Cal. W410 /Accuracy of ±15 seconds per month / Eco-Drive: runs for up to 4 years on a full charge with power save function / Bluetooth® (Time sync, call notifications, smartphone search, mail/SNS notifications, disconnect notification) / Power save function/ Perpetual calendar / Alarm/ Light level indicator※5 / Battery charge meter※6 / World time (316 cities including UTC) / Shock detection※7 / Connection display
■Water Resistant to 10 BAR * ■ Night light (hands / indices)
Indicates the running time from a full charge until the charge runs out (without recharging). Approx. 1 year when paired with a smartphone/approx. 2 years 6 months when not paired with a smartphone.
  • *1. Eco-Drive is CITIZEN’s proprietary technology that powers watches using any natural or artificial light source, eliminating the need to replace batteries. Certified as an Eco Mark product for the first time in the watch industry.
  • *2. Super Titanium™ is CITIZEN’s proprietary technology to treat solid titanium with surface hardening technology. It is at least five times harder than stainless steel, resistant to scratches, lightweight and gentle to the skin for comfortable wearing.
  • *3. Duratect is CITIZEN’s proprietary surface hardening technology that enhances the surface hardness of metals such as stainless steel and titanium, protecting watch bodies from scratches and damage. This technology offers excellent abrasion quality and maintains luster of metals for long periods of time. Duratect DLC achieves Vickers hardness of 1,000-1,400 Hv by coating an amorphous carbon hard film — mainly composed of carbon and hydrogen — on the surface of the material. (Vickers hardness of stainless is approximately 200Hv.)
  • About Naomi Osaka

Born on October 16, 1997 in Osaka, Japan to a Haitian father and a Japanese mother. Moved to the U.S. at the age of three and currently resides in Florida. Started out being taught tennis by her father, joined the International Tennis Federation (ITF) tournaments at the age of fourteen, and turned professional in 2013.
Qualified for the Women’s Tennis Association (WTA) tour championship in July of 2014 at the Bank of the West Classic for the first time. In January 2016, at the Australian Open, qualified to enter her first Grand Slam, rolling into the third round and rising into the top 100 of the WTA rankings. In the same year, reached the third round of the French Open and US Open as well. In October 2016, at the Toray Pan Pacific Open, reached her first WTA final and moved into the top 40 of WTA rankings. Won “Newcomer of the Year” at the 2016 WTA Awards, an award given to the player who made the biggest breakthrough. In March of 2018, became the first Japanese woman to win the Indian Wells Masters in California, U.S., also known as BNP Paris Open — in the Premier Mandatory category — widely considered the second biggest event in tennis right behind the Grand Slam, joining the ranks of the world’s top players. Won a Grand Slam singles tournament in September 2018 at the US Open. A must-watch up-and-coming player with a powerful serve, Ms. Osaka takes advantage of her 180cm height and forceful forehand. ”Ranked as the WTA No.1 female tennis player in the world as of 26 August 2019.””


CITIZEN WATCH is a true manufacture d'horlogerie with a comprehensive manufacturing process that extends from creating a watch’s individual components to its final assembly. The company operates in more than 140 countries and regions around the world. Since its founding in 1918, CITIZEN have held the belief of “Better Starts Now” — that is, no matter who you are and what you do, it is always possible to make something better, and now is the time to start doing it. Sharing this belief, we have made watches, invented and improved technologies and explored the future of watches such as our proprietary light-powered Eco-Drive technology and state-of-the-art satellite-synchronized timekeeping.

  • * The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc
  • * Eco-Drive, Super Titanium™, and Duratect are registered trademarks or trademarks of Citizen Watch Co., Ltd.

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