Does it have a countdown timer?

Not out of the box, but it does if you modify it. It's actually really easy to do. Open it up, and remove a small solder jumper by scraping or soldering it off. There are easy YouTube videos on it. I did on mine and now have a countdown timer.

Can it display the time and stop watch at same time?

The time will be displayed at the bottom of the watch.

I need the manual on the watch I accidentally lost it

Here is a link to the User's Manual for this Casio model W800H https://support.casio.com/storage/en/manual/pdf/EN/009/qw3240.pdf

W800hg Series Men S Digital Watch 100 Meter Water Resistance

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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¥10394

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⌚ Stay ahead of time, not behind it.

SET IT AND FORGET IT - Auto calendar and multi-function alarm keep your life perfectly on track.
DIVE DEEP STAY STYLISH - 100-meter water resistance keeps you ready for any adventure, rain or shine.
ALWAYS ON ALWAYS VISIBLE - LED backlight ensures you never miss a beat, day or night.
DOUBLE TIME DOUBLE EFFICIENCY - Dual time feature keeps your global schedule effortlessly synced.
ENDURANCE THAT OUTLASTS YOUR HUSTLE - 10-year battery means no downtime, just nonstop performance.

The Casio W800HG Series men’s digital watch combines rugged 100-meter water resistance with a decade-long battery life, LED backlight for clear visibility, and versatile features like dual time, stopwatch, countdown timer, and auto calendar—crafted for the modern professional who demands reliability and style in every moment.

Specifications

ASIN	B087YZ3G9D
ASIN	B087YZ3G9D
Additional Features	Dual Time, LED Light, Water Resistant, World Time
Age Range Description	Adult
Band Color	Black
Band Material Type	Resin
Band Width	17 Millimeters
Bands	1
Batteries	1 Lithium Metal batteries required. (included)
Best Sellers Rank	#21,802 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #33 in Men's Wrist Watches
Bezel Color	Black
Brand Name	Casio
Case Diameter	37 Millimeters
Case Material Type	Resin
Case Thickness	13 Millimeters
Clasp Type	Buckle
Closure Type	Buckle
Crystal	Mineral
Customer Reviews	4.4 4.4 out of 5 stars (4,586)
Date First Available	May 1, 2020
Department	mens
Dial Color	Black
Display	Digital
Embellishment Feature	Crystal
Face Style	Black
Global Trade Identification Number	00889232267777
Included Components	Casio Men's Quartz Watch with Resin Strap, Black, 17 (Model: W-800H-1BVCF)
Item Type Name	Watch
Item Weight	4.96 ounces
Item model number	W-800H-1BVCF
Manufacturer	CASIO
Manufacturer	CASIO
Manufacturer Part Number	W-800H-1BVCF
Manufacturer Warranty Description	Warranty
Model Name	Casio Men's Quartz Watch with Resin Strap, Black, 17 (Model: W-800H-1BVCF)
Model Number	W-800H-1BVCF
Pattern	Solid
Power Source	Battery Powered
Product Dimensions	10.24 x 1.57 x 0.79 inches; 4.96 ounces
Series Number	800
Shape	Square
Sport Type	Walking
Strap Type	Adjustable
Style Name	W-800H-1B
Theme	Standard
UPC	889232267777
Warranty Type	Manufacturer
Watch Movement Type	Quartz
Water Resistance Depth	100 Meters
Water Resistance Level	Water Resistant

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