Casio WS1600H-2AV Digital Quartz Watch Blue Resin Strap 100M WR 10 Year Battery Countdown Timer - Sold By Amazon US

Limited Time Deal: Dispatches from Amazon US / Sold by Amazon US = no extra charges, will be a longer delivery time

Model Number: WS1600H-2AV

• Included CR2025 battery provides 10 years of use before you need service

• 100m/10ATM water resistance rating ensures safety during light water activities

• The "WORLD TIME" feature includes 29 different time zones (48 cities) with city code display, and daylight saving time on/off

• Additional features include a stopwatch, daily alarm, and time signal functions.

Inspired by the sporty design of the 1990s, the dial features two bars and a circle at the top that display three different timers: the 1/20 second stopwatch in a color bar above, the ten-second stopwatch in the bar below, and the one-minute stopwatch in a circular display on the right.
These multi-sport watches are always ready to use, with a 10-year battery, water resistance up to 100 meters, LED lighting, countdown and alarm.

Official Casio webpage: casio.com/int…AV/

Operation Guide weblinks

Case size (L× W× H) 45 × 42.1 × 12.5 mm
Weight 39 g
Case and bezel material Resin
Band Resin Band
Water resistance 100-meter water resistance
Power supply and battery life Approx. battery life: 10 years on CR2025
Glass Resin Glass
Compatible band size 145 to 215 mm
World time World time 29 time zones (48 cities), city code display, daylight saving on/off
Stopwatch Stopwatch: Add time timer for injury timeouts, etc.
Measuring unit: 1 second (upper and lower display)
Measuring capacities: Upper display: 59'59"; Lower display: 99'59"
Measuring modes: Elapsed time, event timer
Timer
Preset timer Measuring unit: 1 second
Preset start times: 10, 12, 15, 20, 25, 30, 35, 40, 45 minutes
Timer modes: Elapsed time, auto-repeat*
Measurement of elapsed time for up to 60 minutes after the countdown reaches zero
Timers
Up to nine timers can be preset with separate starting times for timing of intervals.
Measuring unit: 1 second
Input range: 59'55. (5-second increment and 1-minute increments)
Other: Auto-repeat
Alarm/hourly time signal Daily alarm Hourly time signal
Calendar Full auto-calendar (to year 2099)
Mute feature Button operation tone on/off
Accuracy Accuracy: ±30 seconds per month
Other features
12/24-hour format
Regular timekeeping: Hour, minute, second, pm, month, date, day

A Redditor shows theirs off: New WS1600H-2AV : r/casio (reddit.com)Also from Reddit, May 2023: Which design of the WS1600H is best? : r/casio (reddit.com)

Keepa says (sorted by New, as Amazon US are treated as a third-party seller), keepa.com/Amazon reviews, here
The New Affordable Classic! | Casio Countdown Timer WS1600H-1AV (a typo, I suspect, as he says -2AV in the video!) Unbox, Review & Giveaway! from Maverick Watch Reviews (September 2023):
How to set the Casio WS1600H watch time and date from rmenga (June 2023):